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 Headlight issues 
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Granny Driver

Joined: Thu Oct 13, 2011 11:45 am
Posts: 26
Location: Denver Colorado
Post Headlight issues
I have read tons of posts about headlight issues but none seem to cover my issues. My lights will turn on but will not rotate up. On very rare occasion they will work. I have taken apart the headlight motor and cleaned it and adjusted the position sensors and inspected wiring harness but there was nothing obvious that could be the issue. I also have a spare headlight relay but that did not change the issue. Does anyone know if there is a ground wire that I could check? Or how to test the relay or headlight motor?

Thanks
81 928

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Jay

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


Mon Jan 09, 2012 12:53 pm
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Joined: Mon Jan 07, 2008 8:43 pm
Posts: 2078
Location: Sunny San Diego
Post Re: Headlight issues
How about your Headlight Switch?

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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


Mon Jan 09, 2012 2:08 pm
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Granny Driver

Joined: Thu Oct 13, 2011 11:45 am
Posts: 26
Location: Denver Colorado
Post Re: Headlight issues
Good thought I'll try that out.

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Jay

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


Mon Jan 09, 2012 9:24 pm
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Joined: Mon Jan 07, 2008 8:43 pm
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Location: Sunny San Diego
Post Re: Headlight issues
I would go to 928 Intl and get a good used Headlight Switch and Relay. They guarantee their used stuff for a year.

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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


Tue Jan 10, 2012 6:39 am
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Granny Driver

Joined: Thu Oct 13, 2011 11:45 am
Posts: 26
Location: Denver Colorado
Post Re: Headlight issues
I have a little update. I have been driving the shark for the past couple weeks and I have found out that when the headlights work the volt gauge does not work and the fuel gauge will show full. Could this be the relay or maybe it could be a bad ground? I will be working on it this weekend and I don't want to just order parts on a hunch but I would like to get to the bottom of the problem.

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Jay

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


Sat Jan 14, 2012 8:25 am
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Post Re: Headlight issues
Hmm, not real sure on the circuitry, but have you taken your Pod off yet? The PCB (printed circuit board) behind the Instrument Cluster is know to fail at the connection points. It sounds like your shorting somewhere. There are multiple ground points all over the 928, this is the first thing that needs to be cleaned before moving forward with any electrical work.

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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


Sat Jan 14, 2012 8:30 am
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Speed Limit Obeyer
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Joined: Thu Nov 25, 2010 12:19 pm
Posts: 81
Location: Melbourne, Australia
Post Re: Headlight issues
the other thing to look for is blown fuses, i had a couple blown on my car and they were causing all sorts of odd things to happen like the "!" light on the dash being permantly half on, etc.

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1986 Porsche 928 "ROW" 5 Litre Auto Metallic Maroon - Maroon/Brown Leather Interrior
(and whilst it's not a Porsche)
1948 Morris MS-6, 2.2 strait 6, 4 on the tree manual, green exterior, red leather interior


Sun Jan 15, 2012 3:15 pm
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Speed Limit Obeyer
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Joined: Tue May 26, 2009 11:33 pm
Posts: 88
Location: Edmonton AB
Post Re: Headlight issues
MP is right about your headlight switch,common failing point if the headlights won't rise.If you have never had the switch out it is fairly easy to do,pull the headlight knob off and what you will see is the switch just like the replacement you should have in your hand.Take two small screwdrivers on either side of the switch and pry out.It is a simple connection off the back of the switch just careful not to pull to hard and stress the wires and also not let the cable fall back into the pod.Reverse order to assemble and viola headlights should come up and down.As for the rest of your problems,if your headlights are up and running and your getting wonky dash problems,check two things first #1 check that all grounding points are clean, disconnect battery and remove clean all contact points and make sure battery is fully charged while out.Jack up right front of car so you can safely work underneath,there is a main grounding cable that runs from the right side of the engine to the chassis under the passenger side,you can't miss it and clean till shiny.Check the the wires and connections on the alternator these can cause all kinds of problems.Lastly pull the cover off your relay/fuse box in the passenger footwell,remove and replace each fuse a couple of times,leave the relays alone as they are a bitch to remove so unless you know for sure you have a relay problem just leave it for now.Reinsert battery pos/neg fire her up and see if your problems disappear.If you still have an issue with wonky dash readings with your headlights up and on make sure your alternator is ok as I had a similar problem with mine.Make sure all of this is done first before you start chasing your tail. :driving:

Just my two cents
Kurt


Wed Jan 18, 2012 7:56 pm
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Granny Driver

Joined: Thu Oct 13, 2011 11:45 am
Posts: 26
Location: Denver Colorado
Post Re: Headlight issues
I am still working through these headlight issues but I have tried the switch and it seemed to work. Well when I turn it I can hear the relay click once and my assumption is that it is working. I have gone through all the ground wires except the one below the passenger side door (I'll get there this weekend). I was thinking about replacing some the older fuses or at least reseat them. But for now I will drive in the daylight until I get this fixed. I just love driving the car.

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Jay

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


Thu Jan 26, 2012 9:24 am
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Joined: Mon Jan 07, 2008 8:43 pm
Posts: 2078
Location: Sunny San Diego
Post Re: Headlight issues
Most of us have replaced all those fuses. Just make sure you print out the fuse diagram from 928 specialists website. Disconnect your battery, then remove all the fuses, then wires brush all the fuse contacts. I used compressed air to make sure no bristles get left behind and cause a short. Replace the fuses with new ones using the chart. I got my fuses off ebay.

Like this auction, but someone sells a combo pack.

http://www.ebay.com/itm/IMC-831-54019-3 ... 231599329f

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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


Thu Jan 26, 2012 11:11 am
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