Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

Sorted electrical gremlins, interior lights, and installed LED's (long rant w/pics)

Thread Tools
 
Search this Thread
 
Old 10-11-2018 | 10:41 AM
  #1  
997TTEQNY's Avatar
997TTEQNY
Thread Starter
Racer
 
Joined: Jun 2017
Posts: 402
Received 51 Likes on 35 Posts
From: Long Island, NY-East End
Default Sorted electrical gremlins, interior lights, and installed LED's (long rant w/pics)

My saga of my mysterious interior lights and odd behaving electrics has come to a close.

When I took delivery of the car last week, none of my interior lights worked with the exception of the map light in the manual position.
When I selected either door light to open with the door pin (manually via with the black switch), both bulbs dimmed indicating a short somewhere.
After a week of fiddling, I was finally able to get all of my interior lights up and running and I am quickly finding out how these cars can get a bad rep for electrical issues due to people with a poor skill-set working on them.

From what I can best tell, the previous owner attempted to hook up a new map light (as mine is brand new with a shiny bright white made in germany sticker), but did not hook it back up correctly.
That caused a chain reaction (insert panic here) which made him reverse the passenger door circuit which in turn shorted out the entire circuit (#24).
He then turned his wisdom to the dome light and had polarity reversed there as well as it likely wasn't turning off no matter what he did.
My suspicion is that he did this because the hatch pin had deteriorated to the point where the connections were touching causing that circuit to constantly stay on. At that point I think he threw in the towel!
His solution there was to unplug, and hide the central door circuit in the headliner with electrical tape and use the other existing circuit to fire the map light manually.

He then stuffed a 10 amp fuse in a 5 amp circuit and sold me the car. The problem in doing this was the collateral damage it caused to other systems:

-Clock dead
-Read Hatch dead
-Warning chime would constantly stay on barely audible and without and central warning lights.

Thankfully all of those functions have returned to normal, and I have installed some cheap LED lights that I bought off amazon for $10. I'm a stickler for OEM, and searched for a warmer temperature bulb but for now they will do the trick.

I also sourced a used wiper motor off of ebay for $100, and the motor instantly came to life. However, the wiper would only go in one direction and then become disconnected. I took a look at the receiving arm, and could see it was bent upward. So, I pulled out that assembly, bent it back, and now have a working rear wiper. I also ordered a new switch from suncoast for good measure.

I'm now waiting on a new dash dimmer and rear hatch pin from Pelican, and would like to get my rear fog light working (which I think may just be a fuse or relay).

Tonight I am going to put the car up on jack stands, and pull the wheels off which will be sent to powder coating + new rubber.

I know it needs new struts, so may tackle some of the suspension bits myself.. The car is due for a timing belt, and I know there are step by step instructions here.. So I am debating whether to do it myself....let me know what you all think.. how hard on a scale of 1-10?

Thanks for all the support guys.

`Kurt

Old 10-11-2018 | 11:04 AM
  #2  
gazfish's Avatar
gazfish
Rennlist Member
 
Joined: Feb 2016
Posts: 1,047
Received 195 Likes on 144 Posts
From: Dublin, Ireland
Default

I like to rate jobs in terms of "what's the worst that can happen", and when it comes to the timing belt it's not a 10 in terms of difficulty if your methodical, take your time and do a lot of research but the thought that I could do serious internal damage to the engine means I'd personally pay someone else with the right experience.
Old 10-11-2018 | 03:33 PM
  #3  
Wisconsin Joe's Avatar
Wisconsin Joe
Nordschleife Master
 
Joined: Jan 2013
Posts: 5,926
Received 304 Likes on 232 Posts
From: Kaukauna Wisconsin
Default

Timing belt isn't that big of a deal.

Long and involved.
Significant potential for problems (broken bolts on the WP are a pain)
Beware the WYAIT rabbit hole.

But it's just parts bolted to parts.
Follow the writeup for your engine (16v, S3 & S4 are different).
Double check everything.

Lots of folks have done it correctly. Me included (didn't do the water pump).
Old 10-11-2018 | 05:26 PM
  #4  
997TTEQNY's Avatar
997TTEQNY
Thread Starter
Racer
 
Joined: Jun 2017
Posts: 402
Received 51 Likes on 35 Posts
From: Long Island, NY-East End
Default

Originally Posted by Wisconsin Joe
Timing belt isn't that big of a deal.

Long and involved.
Significant potential for problems (broken bolts on the WP are a pain)
Beware the WYAIT rabbit hole.

But it's just parts bolted to parts.
Follow the writeup for your engine (16v, S3 & S4 are different).
Double check everything.

Lots of folks have done it correctly. Me included (didn't do the water pump).
Thanks am considering. I'm already in the WYAIT rabbit hole.. HELP!
Old 10-11-2018 | 07:28 PM
  #5  
Majestic Moose's Avatar
Majestic Moose
Burning Brakes
 
Joined: May 2016
Posts: 832
Likes: 0
Received 44 Likes on 28 Posts
From: Nazareth, PA
Default

Nice work righting the wrongs. Figuring out the work from previous owners is a whole other world of troubleshooting.

You seem pretty competent and the timing belt and water pump are not difficult to change. The hard part is knowing where to stop as the engine mounts and oil pan gasket are likely past due not to mention the fuel and power steering hoses which should be replaced immediately. Enjoy the car for another month or so then tear into it over the winter so you will have a fresh car in the spring
Old 10-11-2018 | 08:53 PM
  #6  
awilli6's Avatar
awilli6
Rennlist Member
 
Joined: Oct 2010
Posts: 1,079
Likes: 0
Received 28 Likes on 16 Posts
From: Memphis, TN 1987 S4
Default

Do the TB & WP yourself. I followed Dewayne’s write-up. Can’t go wrong. I’m not a mechanic and completed the job twice without issue. Plus, you know it was done correctly. Not many mechanics who know the 928.



Quick Reply: Sorted electrical gremlins, interior lights, and installed LED's (long rant w/pics)



All times are GMT -3. The time now is 06:43 PM.