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Newbie69 Samba Member
Joined: December 08, 2022 Posts: 2
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Posted: Thu Dec 08, 2022 1:33 pm Post subject: Wiring for rear window defroster |
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I have a 08/69 beetle sedan. I'm trying to connect electrical wiring for thr rear window defroster , I can not locate the regulater? The previous owner may not have reinstalled it during their complete rewire. Hoping for help where the regulater should have been placed? |
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Cusser Samba Member
Joined: October 02, 2006 Posts: 31353 Location: Hot Arizona
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Posted: Thu Dec 08, 2022 1:41 pm Post subject: Re: Wiring for rear window defroster |
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The switch for the defogger was under the dash near the driver. The relay was under the rear seat, driver side. For USA VWs with driver on the left.... _________________ 1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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vamram Samba Member
Joined: March 08, 2012 Posts: 7297 Location: NOVA
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Posted: Thu Dec 08, 2022 2:24 pm Post subject: Re: Wiring for rear window defroster |
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You need a 30A general purpose relay; it gets its power from fuse #10,at least on a '73 Super. Check the Samba technical section for the wiring diagram for your year.
Come to think of it...did '69 even have a defroster?? _________________ Eventually, "we are what we pretend to be.’”
Give peace a chance - Stop Russian-Soviet Aggression!!
'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...waiting it's turn in line behind '74.
Click to view image
Save the Supers!! |
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Cusser Samba Member
Joined: October 02, 2006 Posts: 31353 Location: Hot Arizona
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Posted: Thu Dec 08, 2022 3:14 pm Post subject: Re: Wiring for rear window defroster |
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I think 1969 was first year of rear window defroster.
I got my 1970 sedan in 1972, and I must say that this didn't seem to work very well on mine, maybe because most trips in winter were under 30 minutes. _________________ 1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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Newbie69 Samba Member
Joined: December 08, 2022 Posts: 2
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Posted: Thu Dec 08, 2022 5:05 pm Post subject: Re: Wiring for rear window defroster |
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From the wiring diagram which I viewed for 08/69 .there is a regulater C1 that appears to be between the generator and (relay that is under back seat). Most likely not the right way, wondering if I could just run a hot straight from the B+ generator to the relay with an inline fuse? Or tap into the starter wire that is next to the relay.
All other wires that are needed for relay and defroster switch are there. |
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Jimbug57 Samba Member
Joined: October 08, 2002 Posts: 817 Location: Mid Michigan
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Posted: Fri Dec 09, 2022 5:41 am Post subject: Re: Wiring for rear window defroster |
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I would tap into the starter wire with #10 AWG and a 30 amp inline fuse. I never connect anything direct to the gen/alt. _________________ Repeat after me "I am smarter than metal!" |
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sb001 Samba Member
Joined: May 19, 2011 Posts: 10406 Location: NW Arkansas
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Posted: Fri Dec 09, 2022 7:22 am Post subject: Re: Wiring for rear window defroster |
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Newbie69 wrote: |
From the wiring diagram which I viewed for 08/69 .there is a regulater C1 that appears to be between the generator and (relay that is under back seat). |
The voltage regulator under the rear seat has nothing to do with the rear defrost system. VW just used the B+ terminal on it as a convenient location to branch off the hot lead from the battery over to the rear defrost relay, since they are both under the back seat.
Since you have switched to an internally regulated alternator and are now missing that voltage regulator, I would just simply run a wire with an inline fuse directly from the battery + terminal over to terminal 30 on the rear defrost relay. _________________ I'm the humblest guy on this board.
1969 autostick sedan, family owned since new
1600 SP engine
Solex 30 PICT 3 carburetor
Bosch 113905205AE autostick distributor |
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sb001 Samba Member
Joined: May 19, 2011 Posts: 10406 Location: NW Arkansas
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Posted: Fri Dec 09, 2022 7:35 am Post subject: Re: Wiring for rear window defroster |
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Actually you should just be able to splice in to this wire since it comes over from the battery, and run a FUSED lead over to terminal 30 on the rear defrost relay. This would basically be the same thing VW did. _________________ I'm the humblest guy on this board.
1969 autostick sedan, family owned since new
1600 SP engine
Solex 30 PICT 3 carburetor
Bosch 113905205AE autostick distributor |
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cletus_zuber Samba Member
Joined: January 08, 2010 Posts: 2406 Location: Gladstone, Ore
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Posted: Sat Dec 10, 2022 7:14 pm Post subject: Re: Wiring for rear window defroster |
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Read this before getting too far into it, your grid is most likely long dead.
http://www.vw-resource.com/defogger.html _________________ 1972 1302
HPMX 40's & 019 |
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vwracerdave Samba Member
Joined: November 11, 2004 Posts: 15298 Location: Deep in the 405
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Posted: Sat Dec 10, 2022 7:21 pm Post subject: Re: Wiring for rear window defroster |
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Show of hands.
Lets see how many people have a working rear window defroster.
I have never talked to anybody that does. _________________ 2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
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vamram Samba Member
Joined: March 08, 2012 Posts: 7297 Location: NOVA
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Posted: Sat Dec 10, 2022 8:06 pm Post subject: Re: Wiring for rear window defroster |
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vwracerdave wrote: |
Show of hands.
Lets see how many people have a working rear window defroster.
I have never talked to anybody that does. |
My '73 Super has a working rear defrost....an aftermarket window. I have an original rear window from a '71 that has good continuity across all the lines. Never had a car for it though, bought it before I learned '72 rear windows were slightly bigger. _________________ Eventually, "we are what we pretend to be.’”
Give peace a chance - Stop Russian-Soviet Aggression!!
'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...waiting it's turn in line behind '74.
Click to view image
Save the Supers!! |
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Cusser Samba Member
Joined: October 02, 2006 Posts: 31353 Location: Hot Arizona
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Posted: Sun Dec 11, 2022 8:32 am Post subject: Re: Wiring for rear window defroster |
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vwracerdave wrote: |
Show of hands. Lets see how many people have a working rear window defroster. I have never talked to anybody that does. |
Mine worked on my 1970, purchased in 1972. At least it did work somewhat, and that was in the 1970s. I'm in Arizona desert, so there really wasn't much reason to even try to use it.
When I resurrected that VW in 2016-2017 after its retirement in 1993 I did check for continuity on its rear window grid when I had the rear window out to replace the rubber seal, and I had no continuity by then. So I just ignored that, and re-installed it with the new seal.
I wonder if there are small-enough stick-on rear window defroster grids available......they exist for larger windows.... _________________ 1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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Multi69s Samba Member
Joined: January 24, 2006 Posts: 5363 Location: Lefty, CA
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KTPhil Samba Member
Joined: April 06, 2006 Posts: 33989 Location: Conejo Valley, CA
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Posted: Mon Dec 12, 2022 5:33 pm Post subject: Re: Wiring for rear window defroster |
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Mine worked when new (1971), but not well since about the late 1980s.
What you see are the primer paint lines, not the actual conductive/resistive material, which likely has long since evaporated.
They were always treated gently, it was just a poor electrical/mechanical design that can't last. You'd be far better off with a small forced air heater aimed for best effect, using the same wiring and relay. |
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vamram Samba Member
Joined: March 08, 2012 Posts: 7297 Location: NOVA
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Posted: Mon Dec 12, 2022 6:37 pm Post subject: Re: Wiring for rear window defroster |
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KTPhil wrote: |
You'd be far better off with a small forced air heater aimed for best effect, using the same wiring and relay. |
That sounds like a really good idea...any particular heater/fan in mind? _________________ Eventually, "we are what we pretend to be.’”
Give peace a chance - Stop Russian-Soviet Aggression!!
'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...waiting it's turn in line behind '74.
Click to view image
Save the Supers!! |
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madmike Samba Member
Joined: July 11, 2005 Posts: 5292 Location: Atlanta,Michigan
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Posted: Mon Dec 12, 2022 7:23 pm Post subject: Re: Wiring for rear window defroster |
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Good luck with that,Most all of them suck up to many Amps _________________ 'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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KTPhil Samba Member
Joined: April 06, 2006 Posts: 33989 Location: Conejo Valley, CA
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Posted: Tue Dec 13, 2022 11:22 am Post subject: Re: Wiring for rear window defroster |
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I don't have a particular suggestion, and they are not super hot/super flow, or they take too much current. But a well-aimed air pusher, plus a little heat, might go a long way.
Maybe check the Bus forums for heater/blower suggestions, since they have well-known heater issues! |
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sb001 Samba Member
Joined: May 19, 2011 Posts: 10406 Location: NW Arkansas
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Posted: Tue Dec 13, 2022 11:33 am Post subject: Re: Wiring for rear window defroster |
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KTPhil wrote: |
They were always treated gently, it was just a poor electrical/mechanical design that can't last. . |
What part about the original system was the main design flaw- did the system send too much current through it, did they use bad adhesive to stick the grid to the window, etc? I've always wondered if buying one of the new windows with a new defrost grid would yield better, same, or worse results
https://www2.cip1.com/vwc-111-845-501-k/ _________________ I'm the humblest guy on this board.
1969 autostick sedan, family owned since new
1600 SP engine
Solex 30 PICT 3 carburetor
Bosch 113905205AE autostick distributor |
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KTPhil Samba Member
Joined: April 06, 2006 Posts: 33989 Location: Conejo Valley, CA
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Posted: Tue Dec 13, 2022 11:37 am Post subject: Re: Wiring for rear window defroster |
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The resistive material degraded over time, even if on the shelf, I have read.
In aerospace, we do "high temperature accelerated aging tests" to predict life expectancy. Maybe VW (or their suppliers, Sekurit, Siglia?) didn't do this back then? |
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