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vancan924 · Joined: 06 May 2007 Posts: 13 Location: vancouver, canada

it never did turn over strong with the key, but she usualy fired. then all of a sudden it would only turn a short crank and then stop, almost like a realay or conection was over heating or shorting out. now she doesnt turn over at all with the key, but if i jump the wire in the harness going to the starter it turns over great but wont fire? i also checked the fuses and with the ignition in the on position only half the fuses are live, could this be part of the problem, what could cause this? the interior lights etc work but the voltage at the coil is only around 7 volts.

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

Where exactly did you jump the wire. If you only bypassed the ignition switch, it would indicate that this is where the fault lies, which could also explain only half the fuses being live. What is and isn't working. If it's every thing on the '51' circuit, it's most likely the ignition switch.

If your car has ballast resistors, then 6 - 7 V at the coil is correct when the engine's running.
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

vancan924 · Joined: 06 May 2007 Posts: 13 Location: vancouver, canada

near the battery box where the heavy positive wire enters the sleeve with the wires coming from the ignition, thats where i jumped it. the low voltage at the coil is when the ignition is in the on position and the engine is NOT running

Smoothie · Posted: Sat May 19, 2007 12:54 am Post subject:

The lower coil voltage is normal for your car with the ignition switched on - the engine doesn't have to be actually running. It goes up (to closer to 12V) while the starter is activated (the starter solenoid closes a switch contact to send a higher voltage to the coil during starting). If coil voltage goes up while you're jump starting it, then the solenoid and its' connections are ok, otherwise somethings wrong there. -But that would be a secondary issue - the primary problem is still most likely with the ignition switch. After that, suspect and check the 3-pole connector "T3a" in the engine compartment (Haynes pg. 252, current track 5)(actually, check this first because it's easier than dealing with the ignition switch). Then I'd suspect+check the A10 connection on the back of the fuse-relay panel (this is a more involved endeavor, so obviously check all the pins on back of the panel if/when you have it out).
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

vancan924 · Joined: 06 May 2007 Posts: 13 Location: vancouver, canada

just ordered a manuel, will pick it up on the way home tonight. i dropped the fuse box and found a lot of corosion on the back connections, some of the fuses are not making contact due to corosion on the fuses. only half of the fuses are receiving power when the ignition is in the on position. I'm starting to think ignition. will i cause any damage if i by pass the ignition and take power directly to the fuse panel from the battery?

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

Lizard · Posted: Tue May 22, 2007 1:38 pm Post subject:

vancan,
I am back in Vancouver now, pm me your phone # and I will give you a shout within the next day or so.
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3 928s,

vancan924 · Joined: 06 May 2007 Posts: 13 Location: vancouver, canada

wa-hooo she's running great now, if only i had brakes!!!!! anyone with a master cylinder?

Lizard · Posted: Tue May 29, 2007 7:08 am Post subject:

so I am guessing the switch and cleaning the contacts in the fuse box fixed her.

might try posting a wanted add in the buy sell section
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3 928s,

vancan924 · Joined: 06 May 2007 Posts: 13 Location: vancouver, canada

you bet, thanks. the main problem was the fuse panel, even with the new ignition there wasnt enough power getting to the relay to turn on the fuel pump. once i rebuilt the fuse panel the old ignition worked but sometimes cut out, so it was a good thing i had the new one. i posted an add in the want section already, even called weissach and they say they cant get one. maby someone on the board has adapted a different one and can tell me how.