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Headlight motor woes '“ 944 electrics knowledge required before entering!!

Black Beauty

Black Beauty

Member

Gents,
For some time now I've had an issue with my headlights not being able to go up and down so after replacing the relay, the switch, the fuse, bench testing the motor, searching every page of here and the Rennlist forum for a similar issue and following the Clarks guide instructions to the letter and also reading the wiring diagrams, I can do no more hence calling on your help.

Now, I must state that I'm not an electrician, everything I've done is what I think is a worthwhile test and I openly admit that I don't know everything and that there must be something that I am missing.

So before calling the auto electrician I thought I would ask the sages on here

To help with your analysis, you can see the testing I have done in the tables below, geek alert! [:(] [:)][&:][:)][&:]


944headlight2.jpg



I've tested for continuity and I have continuity up to the switch for all wires, the only wire I haven't tested is the supply wire, but I figure that is ok, due to being able to trigger the motor to move by jumping the wires as shown below.

There's obviously a lot wrong with the above, but this is where my knowledge ends and hopefully yours begins :praying:

HEEEELLLLLLLLLLLLLLLLLLPPPPPPP [:(]
 
ORIGINAL: zcacogp
The S2 is a much, much better car than the turbo.
Hope that helps.
Oli.
Click to expand...

It helped thanks, never had such a laugh at work... [:D]

Sorry Black Beauty...
 
I would go for a bad earth first. then check all the connections.



also the S2 is a better car than both the Turbo and the 3.2 carrera in fact the S2 is the best car that Porsche has ever built.
 
Ok... First I would agree that an earth problem is quite likely, however, I would ask if you are checking the voltage with or without a load applied? A multimeter draws stuff all current, so disconnect the motor, and you'll probably see 12v across the terminals, no matter how crudded up the connections to that point are. Put the motor back on and try and make it work, and probe it and you may find that you only have a couple of volts at the motor. The trick the. Is determining which connector it is which is causing the problem. Common problem on fuel pumps, windows, all sorts on the earlier cars.
Does yours have air-con? Nothing to do with your problem, but I have a soft-spot for early dash cars, especially black and with air!
 
On our grey 924S,when suddenly got headlamps stopping partway leaving lamps on,I did all the Clarkes Garage tests to no avail-then decided to pull the triangular loom connector apart & found verdegris deposits deep down -once cleaned up-alles gut.
 

ORIGINAL: tref

Ok... First I would agree that an earth problem is quite likely, however, I would ask if you are checking the voltage with or without a load applied? A multimeter draws stuff all current, so disconnect the motor, and you'll probably see 12v across the terminals, no matter how crudded up the connections to that point are. Put the motor back on and try and make it work, and probe it and you may find that you only have a couple of volts at the motor. The trick the. Is determining which connector it is which is causing the problem. Common problem on fuel pumps, windows, all sorts on the earlier cars.
Does yours have air-con? Nothing to do with your problem, but I have a soft-spot for early dash cars, especially black and with air!
Click to expand...

Tref,

It doesn't have air con, just a very simple spec car whichnis a joy to drive.

What do you mean with or without a load applied when checking the voltage?

Spence
 

ORIGINAL: VITESSE

On our grey 924S,when suddenly got headlamps stopping partway leaving lamps on,I did all the Clarkes Garage tests to no avail-then decided to pull the triangular loom connector apart & found verdegris deposits deep down -once cleaned up-alles gut.
Click to expand...

Which one is the triangular connector?
 
Not sure about your car but on mine the earth is down beside the passenger side headlight on the chassis leg. I simple terms you'll find a bunch of wires bolted to the body. Take them off and clean all the terminals then clean the earth point on the body and put it all back together.
 

ORIGINAL: Black Beauty


ORIGINAL: tref

Ok... First I would agree that an earth problem is quite likely, however, I would ask if you are checking the voltage with or without a load applied? A multimeter draws stuff all current, so disconnect the motor, and you'll probably see 12v across the terminals, no matter how crudded up the connections to that point are. Put the motor back on and try and make it work, and probe it and you may find that you only have a couple of volts at the motor. The trick the. Is determining which connector it is which is causing the problem. Common problem on fuel pumps, windows, all sorts on the earlier cars.
Does yours have air-con? Nothing to do with your problem, but I have a soft-spot for early dash cars, especially black and with air!
Click to expand...

Tref,

It doesn't have air con, just a very simple spec car whichnis a joy to drive.

What do you mean with or without a load applied when checking the voltage?

Spence
Click to expand...
Without load: disconnecting the motor, and probing where the motor should plug in with the multimeter. With load, leaving the motor in place, easing the connector apart a little sufficient to get the multimeter probes onto the terminals you are interested in (very carefully so as not to short any of them out) or probing the back of the connector block. The first method (without load) will very rarely read anything other than full battery voltage. The latter will show up if there is a resistance in the wiring other than at the motor itself - with the latter method, if it reads 12v it is a fault internally with the motor, if it reads significantly less than 12v, it is a fault in the wiring (obscure problems excepted!).
 
My car, (1988 951), had a similar problem, Head lights would sometimes refuse to either raise or lower. Problem eventually traced to being the multi-pin connector at the headlight motor making intermittent connection.
A previous owner had even wound baking foil around the pins of the connector in an attempt to cure the connection problem.
 
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