1972 battery ground cable strap connection location

bwaz · Samba Member Joined: August 24, 2004 Posts: 1780

Here's mine

Image may have been reduced in size. Click image to view fullscreen.

Xevin · Samba Member Joined: January 08, 2014 Posts: 7635

Nice. I love having a 76 engine with a six rib in my 72.
Sent you a PM for something I'm working on.
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aeromech · Posted: Thu Jun 04, 2015 1:04 pm Post subject:

Xevin · Samba Member Joined: January 08, 2014 Posts: 7635

Wow! Looks great. I see some good times ahead for that couple.
Might want to get a screen on that Wink

I kid, you know that already but you know some yahoo would say that Laughing

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Keep on Busin'

aeromech · Posted: Thu Jun 04, 2015 11:24 am Post subject:

Thanks, here's a more recent picture

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Lead Mechanic: San Diego Air and Space Museum
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Boeing 727,737-200-300-400,757,767
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Xevin · Samba Member Joined: January 08, 2014 Posts: 7635

aeromech · Posted: Thu Jun 04, 2015 10:45 am Post subject:

Okay, full disclosure. After I installed the rivnut and fabricated the new ground wire I looked closer and actually located the original grounding place which is a nut welded to the battery tray shown here with the red arrow. The blue arrow shows the modification I did. This is a 1972 bus.

_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

rustbus · Posted: Thu Jun 04, 2015 10:23 am Post subject:

my 72 had a hole already here:

not sure if it was original - cable connected to it bottom right...any chance you have a hole there too or did a PO drill mine?
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May of '72 Deluxe. Red Bay Bus

2.0L L-Jet CS & 091 trans conversion
my Bus thread

udidwht · Posted: Wed Jun 03, 2015 9:18 pm Post subject: Re: 72 ground cable strap

aeromech · Posted: Wed Jun 03, 2015 11:13 am Post subject:

The secret is owning a rivnut puller.
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

bwaz · Samba Member Joined: August 24, 2004 Posts: 1780

Thanks for the topic! I'm exactly at the same place with my 72 westy, it came with no motor and virtually no battery tray. I couldn't see anywhere for the negative cable to go from the battery. I've replaced the tray but thought that if the negative bolted to the new tray that the connection might not be as good as to the body. You're solution is great. Thanks again

aeromech · Posted: Mon May 11, 2015 6:48 am Post subject:

Lil Lulu · Posted: Mon May 11, 2015 2:50 am Post subject:

Now it looks just like my '74.
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'65 Beetle "Lil' Lulu"- Ruby Red
1600 stock from '71 bus

'72 Deluxe - Niagara Blue w/pastelwiess Camper Special 2L dual 40 Webers 002

'74 Hightop Weekender "Dixie" 1800 34 Del singles

Malokin Martin · Posted: Sun May 10, 2015 9:05 pm Post subject:

If one is going to ground to the body, it would make sence to ground it on the vertical panel between the light housing and the engine lid. That way the straps are tidy. Just an idea. Coincidentally, this was where my 72 was grounded (likely not OG). Yours does look nice though!

1967250s · Samba Member Joined: May 02, 2007 Posts: 2137

Just measured with my Fluke from battery fan ground ( 8 mm bolt on right side) to the blower fan mount- I get 0.4 ohms. This goes thru fan housing, engine, tranny, tranny strap, body. From the transmission bell to the heater box is 0.2 ohms. Probably same to the battery ground. So-if you ground to the body then you double the resistance, just a tiny amount but measurable.
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'72 Elm Green Deluxe

Tcash · Posted: Sun May 10, 2015 8:15 pm Post subject:

Paint the ground on the chassis or put some liquid electrical tape on it, so it does not corrode.
https://www.google.com/webhp?sourceid=chrome-insta...pe%20lowes

Surprised you did not go to the battery tray.
Tcash

aeromech · Posted: Sun May 10, 2015 7:55 pm Post subject:

Here's what I did today

_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

telford dorr · Posted: Sun May 10, 2015 8:58 am Post subject:

That tells you if you have a problem. If you want to accurately measure and quantify the magnitude of the problem, you'll need to use a more advanced method.
_________________
'71 panel, now with FI
'Experience' is the ability to recognize a mistake when you're making it again - Franklin P. Jones
In theory, theory works in practice; in practice, it doesn't - William T. Harbaugh
When you're dead, you don't know you're dead. The pain is only felt by others.
Same thing happens when you're stupid. - Philippe Geluck
More VW electrical at http://telforddorr.com/ (available 9am to 9pm PST)

Ian · Posted: Sat May 09, 2015 10:57 pm Post subject:

You guys are crazy! You use a "voltage drop" test in VDC to figure that kind of stuff out.
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All your Buses are belong to us.
Love and good roads!
IN LOVING MEMORY OF ROB CRESS 1968-2012
**ACHTUNG DO NOT USE AA BRAND PRODUCTS OR BUY ANYTHING FROM PACIFIC PARTS INTERNATIONAL IN CALIFORNIA**

telford dorr · Posted: Sat May 09, 2015 10:31 pm Post subject:

For reference, the ONLY way to accurately measure real low resistance is to (1) use a meter with 4-wire resistance measuring capability (various high end Fluke and HP meters support this), or (2) do it the hard way: pass a known current (100 ma works well) through the resistance and measure the resulting voltage drop. [This is what the 4-wire measurement method effectively does. The current source is contained inside the meter, hence the extra pair of test leads.]

R = E / I

If I = 0.1 amp, then R = E x 10.

Here's the schematic (from the Gallery) for the current source

Trim R1 for exactly 100 ma current.

12 volts works well for the supply voltage.

Regular 2-wire ohmmeters (including my Fluke 8020B) can't accurately measure anything below, say, 10 ohms. Too many error sources.
_________________
'71 panel, now with FI
'Experience' is the ability to recognize a mistake when you're making it again - Franklin P. Jones
In theory, theory works in practice; in practice, it doesn't - William T. Harbaugh
When you're dead, you don't know you're dead. The pain is only felt by others.
Same thing happens when you're stupid. - Philippe Geluck
More VW electrical at http://telforddorr.com/ (available 9am to 9pm PST)


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1972 battery ground cable strap connection location
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