anpo

This behaviour also occured on my 1990 S4 recently after i installed an daytime running light relay (relay III). However this is not an exact science cause it worked for a short while. Removing relay III works as a workaround but I haven't found out whats causing the problem yet.

When the motor reaches the top point its supposed to signal relay XXIII-XXIV which switches from powering the motor to powering the bulbs. When operating correct the motor cant be running while the lights are on.

Also when a motor from -87 onwards misses its upper limit they normaly get stucked hitting the AC-condenser.

My first post on Rennlist, signed up a few days ago trying to find out whats causing this particular problem

//Anders
928 S4 -90

kraabel

I had to move the condenser back because it was hitting it pretty hard. I don't think it poked a hole in it yet, but it was pretty close. Why Porsche continued to put that arm there over all those years boggles my mind. Well, unless they wanted to sell more condensers and radiators. Both of which they have accomplished in my case.

928worldwide

Other front end damage or all cleaned up but that detail?

kraabel

Just minor neglect issues. The car starts and runs. I haven't taken her on the road yet, but when revving the motor in the garage she cuts out at higher RPMs. I noticed a ground wire coming off near the coil on the passenger side last night. From my '86 it looks like the coil ground. Haven't really looked yet.

I suspect a few sensor wires are broken and typical ground wires off.

anpo

Solved my issues yesterday. I'd been told that one were just to put in a regular relay in slot III to get DRL. This is not true, it should be one with a diode otherwise with ignition on without started motor the relay will short the top limit causing this behaviour. It will work when engine started.

Is relay III present in your ride?

SharkSkin

I have a relay III, but I guess this is an S4 thing. Anyway, glad to hear it was an easy fix.

jpitman2

Might the issue not be related to dirty wiped contacts in the motor? If these dont tell the relay when the lights reach the up position, they will just keep going. Or the 4 wires are misconnected at the 4 way joiner? I used the notes in the 928intl catalogue to reset mine once, and it was wrong....
jp 83 Euro S AT 52k

Alan

On a pre S4 yes - on S4+ models the motor does not keep going in the same direction for down - and the pod adjustment should have it top out on the upper stops before it could keep going around...

Agree its worth looking at the connector and seeing if spomeone has messed with the wiring (or installed the wrong type of motor).

Alan

928worldwide

So are the headlights working properly now?

anpo

928worldwide: They are for me but I don't think so for kraabel who started this thread.

kraabel

I haven't gotten around to getting the motor number yet. Do you know where it's located?

928worldwide

What position are the lights in now?

Alan

The motor is in front of the radiator on the drivers side connected to the drive arm that runs across the front of the car.. it has a rubber cover over the manual operation **** on the top.

Alan

kraabel

The lights issue is solved (for now). I cycled the motor by hand a few times and then cleaned up the relay and pulled the actual pod switch out. A combination of those made things work properly.

I do have a question about the S4, however. When the car starts the running lights are on. When I turn the switch to the first position the hood light comes on.

Is that normal behavior?

Mrmerlin

S4 dont have running lights unless they have been installed later by a PO.
The hood light is wired with the parking/headlights so anytime the hood is open and the light switch is on then the hood light should come on