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  #1  
Old 5th July 2009
1979atariguy 1979atariguy is offline
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My Saabs: 1979 saab 99GL with electric problem
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Default no voltage to radiator fan, trying to diagnose

I got my saab running with a new fuel pump and put in a new hot line from the fuel pump relay, and a new ground wire. But this car has cronic problems, so there are more questions. When i got my car running, took a few tries, i noticed the radiator fan never came on when it should, then it came on for one second, and the fan turned off. The inside fan works fine, but the radiator fan has no current to it. I tested the fan switch for voltage, got nothing, tested the connectors to the fan itself and got nothing, any guesses where to start looking?
-Did some testing: When car is in 'on' position (but not actually turned on yet), voltage is 0 at fan switch, now normally it should be 12 right? because you should be able to jump the switch and have the fan turn on correct?), so then I turned the car on and after a minute voltage is at around 2, then around 4v or so. It seemed that as the temp rose, there was more current going through the wire to the fan switch, but, this doesent make any sense, it should be a constant 12v. Now i tested the connection at the fan and it read 0v, nothing, probably because the car wasnt running for long enough for the switch to make the connection...if i had jumped it it would have only delivered the 2 to 4v anyways and not enough amps to get the fan to run. any suggestions at all?,...just track down the wires?, is it a good idea to take off the black plastic cover on the wires in the engine compartment to try and trace down these wires?, or should i not do that?-Thanks,
Anyone else had major electrical problems?...anywhere i could get a new wiring harness and perhaps just rewire the whole car??, this car is starting to become a pain when one thing gets fixed, another thing goes.

Last edited by 1979atariguy; 5th July 2009 at 07:02 PM.
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  #2  
Old 6th July 2009
1979atariguy 1979atariguy is offline
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My Saabs: 1979 saab 99GL with electric problem
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Now I've had problems with the voltage to the fuel pump and to the radiator fan switch. The car still takes 4 or so tries before it'll start. Tested current to fan switch before i turned the car on was around 7v, after i turned it on, full 14v. Anyone know if it would be an idea to rewire the whole car?, or where I would even find the wiring harness?
My plan: clean off connectors at starter motor, clean off connectors at ground connection (in engine compartment near starter motor connected to frame), clean off connectors at alternator, Any suggestions, or similar problems at all??? any advice appreciated,

OVERALL, does this sound more like a bad ground, or a bad connection coming from the electrical source??
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  #3  
Old 6th July 2009
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nutcase nutcase is offline
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I'd say clean up the ground and clean up the fusebox connections then see if that's any good.
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Old 9th July 2009
1979atariguy 1979atariguy is offline
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I'm in the process of cleaning off all the contacts under the fuse box right now, and have just noticed something from where there seems to be a 'main ground'. I have noticed that many wires connect here (by the radiator fan in the 'hole' between that area and the battery)..that a ground 'strip' goes from the engine/transmission (just noticed this at dark), it's bolted onto there and then goes onto the metal bottom that holds the battery. Do you know what I'm talking about? Anyways, it seems to be covered in gunk and looks black, and the connection is probably not that great. I was wondering where I could find a replacement ground 'strip' for this. By the way, the car still takes 4 or so tries before it will start up again ( it seems a little better now, before it was 6 or 7 tries) , and I'm still trying to find the source of the problem.
THANKS!
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