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 Headlight issues 
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Granny Driver

Joined: Thu Oct 13, 2011 6:45 pm
Posts: 26
Location: Denver Colorado
Post Re: Headlight issues
So I started to chase the headlight unicorn again. I just read through Kurt's email about cleaning the alternator and I will look at that next. It was just replaced not too long ago but you never know. All of the ground points have been cleaned. There was local guy parting out an 1980 928 (same color too) and I bought his relay and headlight motor off him for like $20 and I will try substituting out some parts to see if mine are defective. My thought it’s something in the electrical (genius right). The reason why is that when I bought the car the previous owner had several used parts from 928 intl, like sunroof transmission and relay for the headlights (just to name a few) that were sent with the car. He also replaced the 14 pin connector and thus my thought he was chasing the same things I am currently. I noticed that there is a ground point on the pass side cam cover, is that correct?

All that to say I am open for suggestions!

Oh I did take apart the pod and cleaned the printed circuit board.

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Jay

81 Porsche 928
95.5 S6 Wagon
00 S4
72 Audi 100 LS


Fri Mar 23, 2012 2:47 pm Profile
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Joined: Tue Jan 08, 2008 3:43 am
Posts: 2084
Location: Sunny San Diego
Post Re: Headlight issues
Yes, it's under the Smog Tube and Diverter Valve. It's kind of a pain to get to, but it is the ground for all the passenger side fuel injectors. Ask me how I know this :lol:

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1981 Porsche 928 "Euro" 4.5 Litre Auto Gunsmoke Metallic Flat - Black Interrior
1983 Porsche 928S "US" 4.7 Litre Auto Light Bronze (Copper) Metallic - Brown Interior


Fri Mar 23, 2012 2:55 pm Profile
Granny Driver

Joined: Thu Oct 13, 2011 6:45 pm
Posts: 26
Location: Denver Colorado
Post Re: Headlight issues
Tonight was a triumphant night. I was not planning on working the Porsche tonight but I decided I had an hour to poke around. I was looking at the wiring for the headlights and I started to follow it to the firewall, like I have a hundred times. But I noticed a section of wires right above the hood open indicator that were electrical taped. So I pulled it apart and notcied the colors of wires looked similar to the headlight wires. They were sliced and just twisted together with shrink tape. I thought it odd that they did not use any connection device. Well it was the issue, a couple loose wires and now we are good to go. Three relays, two headlight motors later and a thoroughly cleaned headlight switch and we are in business.
So stoked :D

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Jay

81 Porsche 928
95.5 S6 Wagon
00 S4
72 Audi 100 LS


Thu Apr 05, 2012 3:57 am Profile
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Joined: Tue Jan 08, 2008 3:43 am
Posts: 2084
Location: Sunny San Diego
Post Re: Headlight issues
So awesome! It's like we need a magnifying glass sometimes. I also found a short whenever I would use my windshield wipers, it would blow a fuse. Ended up being a wire smashed when my AC guy was removing my Expansion Valve. Congrats!

_________________
1981 Porsche 928 "Euro" 4.5 Litre Auto Gunsmoke Metallic Flat - Black Interrior
1983 Porsche 928S "US" 4.7 Litre Auto Light Bronze (Copper) Metallic - Brown Interior


Thu Apr 05, 2012 4:06 am Profile
Granny Driver

Joined: Sun Nov 01, 2009 5:19 am
Posts: 1
Post Re: Headlight issues
I have a similarly irritating problem that I cannot locate:
Headlights come on with switch and rotate about 1/4 of the way up and stop (Lights are on). If you turn the lights off they will continue to rotate up to full up then of course stow away without issue. So the motor appears to be in good working order.
Repeats every time.
The fuses are good, I would guess the relay is good because it powers the motor on the stow function and initially is powered when turned on. There should be no microswitch that is made when the light are 1/4 of the way up, so they are out. The dashboard switch powers the circuit up initially (or else they wouldn't move out of the full down position).
Something is interrupting the flow of electricity to the motor when it's 1/4 of the way up, very consistent and exact each time. I would think the relay would be erratic if corroded or faulty.
Do I have a basic misconception of how the system works?


Thu Jan 14, 2016 4:26 pm Profile
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