Alternator wiring...

72westyguy · Samba Member Joined: April 23, 2004 Posts: 6

72 Westy- carburated (dual Weber 34 ICT's)...unhooked the wires from the back of the alternator while cleaning it and don't remember the way the two loose wires go....got the 3 prong connector (no brainer), but also have a red (larger) wire and a black (smaller) wire. inside the back of the alternator there is two posts, a longer one with 2 nuts on it and a short one that only has one nut (probably to secure the plate)...Just want to be sure where these wires go, cause that thing is a pain to get in with motor out of the bus, would hate to pull it in the bus... Please help...Been to the wiring section and its not real clear... Thanks

SGKent · Posted: Sun Sep 25, 2011 9:29 pm Post subject: Re: Alternator wiring...

72westyguy · Samba Member Joined: April 23, 2004 Posts: 6

Its a completely separate wire...

Wildthings · Samba Member Joined: March 13, 2005 Posts: 50337

Without pulling something apart to look, I think the small black wire is just for the dealer diagnostic system and is therefore not needed. IIRC it goes under the same lug as the large red wire.

72westyguy · Samba Member Joined: April 23, 2004 Posts: 6

I followed the wire back through the loom from the engine and tested if it went to ground, and it does not... I thinking it goes to the Alt light on the dash??? I hooked it to the same lug as the big red wire, lets hope it works!

SGKent · Posted: Mon Sep 26, 2011 9:17 am Post subject:

on mine the black wire ties to the red wire at the stud. It originally went to the dealer diagnostic system which is gone from the bus so I clipped the black wire and taped it so it could not short out against anything. I can't say if your black wire is the same or not.
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hercdriver · Posted: Mon Jul 14, 2014 2:15 pm Post subject:

I have found myself with the same question.

Does the large red wire and small black wire go onto the longer B+ post?

The second shorter B post is just left alone?

How does the tin orient? It has three possible locations, but none of them line the large hole in the tin with the female plug terminal on the alternator.

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

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1966 Beetle with sun roof
1975 Westfalia Deluxe

busdaddy · Posted: Mon Jul 14, 2014 3:23 pm Post subject:

I don't recall the hole ever aligning with the plug, orient the tin so the cooling duct is pointing at the shroud when the alternator is in the installed position, there should be a grommet for the wires to pass through.
You are correct about only 1 B+ post being used, make sure it's not too long as some replacements touch the cover, ZZzzzzzzAAAaPP!!!. You can ditch the black wire as well, it's for the diagnostic plug and serves no purpose now.
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Wildthings · Samba Member Joined: March 13, 2005 Posts: 50337

From the angle shown, it doesn't look like your studs are very long, so you should be okay there. You can either clip the black wire at the alternator or zip tie it back on itself. I left mine connected in case I ever want to an a relay for all the ignition accessories like the choke coil, backup lights, etc in the engine compartment, but zip tied the free end out of the way for now.

Hook the wires up to the appropriate spots on the alternator and then make gentle bends in them to get the cover to align with the cooling air boot as per Busdaddy.

hercdriver · Posted: Tue Jul 15, 2014 11:10 am Post subject:

Thanks for the help!

The stud was long, so I ground it down.

Here's the wiring installed with the modified stud. A little dielectric grease and I'd call it done.

Here's the tin installed.

Don't be like the hack that worked on the bus before me. WTF?

_________________
1966 Beetle with sun roof
1975 Westfalia Deluxe

Wildthings · Samba Member Joined: March 13, 2005 Posts: 50337

mtcamper · Posted: Tue Sep 30, 2014 4:43 pm Post subject:

Hi, I'm hooking my alternator up and I just wanted to make sure the red wire goes to the post with two b+ marks on it like in the pic above. For some reason I thought it may have been on the other side with just one b+. I have read about the posts being to long so I will be addressing that on the rebuilt bosch alternator I have. Thanks for any advise I'm just want to make sure I don't hook it up wrong.

busdaddy · Posted: Tue Sep 30, 2014 4:59 pm Post subject:

B+ is B+, if both posts say B+ pick the one that suits you best.
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Rust NEVER sleeps and stock never goes out of style.

Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!

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mtcamper · Posted: Tue Sep 30, 2014 5:04 pm Post subject:

Great. Thanks for the speedy reply!


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