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1980 vw rabbit 1.6l alternator wiring diagram.
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winchin73blazinbaja
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PostPosted: Sun Oct 19, 2014 5:54 pm    Post subject: 1980 vw rabbit 1.6l alternator wiring diagram. Reply with quote

ok I have a 1.6l gas engine out of a 1980 rabbit. i have everything working and wired properly besides the alternator. any one have any idea which posts are supposed to run to where? have hooked it several ways to no avail.
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ps2375
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PostPosted: Mon Oct 20, 2014 7:09 pm    Post subject: Reply with quote

Alt wiring would be the same. The alt could be made by either Bosch(most likely) or Motorola. All you have is power and exciter. If the Alt has 3 terminals for the plug, the 2 large ones are power out and the small one is the exciter.
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winchin73blazinbaja
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PostPosted: Tue Oct 21, 2014 6:49 am    Post subject: Reply with quote

mine is a motorola. it is not actually in a rabbit i have the motor installed in my 74 baja bug. so the small post will run from the battery to the post. the two large posts will run together and back to the battery? (all the positive side of the terminal obviously
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ps2375
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PostPosted: Tue Oct 21, 2014 7:24 am    Post subject: Reply with quote

You need the exciter wire hooked up correctly to get the alt to put out voltage. Try google or looking at the wiring diagrams for nearly any car.
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winchin73blazinbaja
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PostPosted: Tue Oct 21, 2014 7:37 am    Post subject: Reply with quote

i have googled it for this alternator. cannot find anything. or for vw rabbits 1.6l gasoline engines. i find plenty for the diesel alt which has a completely different post layout. your answer should be enough for me to work off of. i have the exciter wire hooked up properly i just need to run the other two posts back to the battery and the post located lower on the alt will run to my charging indicator on my dash.
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ps2375
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PostPosted: Tue Oct 21, 2014 8:01 am    Post subject: Reply with quote

Not sure what the third terminal is for. When I get home in a couple of days, I can check my Bently Manual.
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winchin73blazinbaja
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PostPosted: Tue Oct 21, 2014 8:05 am    Post subject: Reply with quote

that would be great! it has one labeled D+ (the small one), two labeled B+ (the big ones) and one that is down lower that is a small post by itself.
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ps2375
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PostPosted: Tue Oct 21, 2014 8:53 pm    Post subject: Reply with quote

D+ is the exciter, B+ is battery/output. If the one by itself is a threaded stud, it is just a stud for the plug retainer or a ground, depending upon where it is on the alt.
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winchin73blazinbaja
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PostPosted: Wed Oct 22, 2014 2:22 am    Post subject: Reply with quote

I hooked up to d+ and nothing happened Hooked into the small plug on the bottom and had it not charging still. Grounded the alt an now have a weak charge will swap the power wire back to d+ and see if it charges better
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ps2375
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PostPosted: Wed Oct 22, 2014 7:23 pm    Post subject: Reply with quote

Have you had alt tested? Could also be a faulty voltage regulator.
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winchin73blazinbaja
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PostPosted: Thu Oct 23, 2014 5:38 am    Post subject: Reply with quote

i beleive it is running now. Smile swapped the exciter wire to the small post up top and the problem is fixed. i believe. i will hook my multimeter up to it tonight when i get home. the problem I was having is that the alt does not close the circuit until it is in rotation i was testing the posts with the ignition turned on and not started. it was a rookie mistake. Razz
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ps2375
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PostPosted: Thu Oct 23, 2014 2:26 pm    Post subject: Reply with quote

A minor over-sight. LOL
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