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tbirdguy · Posted: Wed Jul 28, 2010 10:07 am Post subject: Coil Resisters

I have a 1977 that has the two coil resisters. I have noticed that they get extremely warm, even to the point of being hot while the engine is running. Is this a normal situation? I know that a typical resister will heat up somewhat, but this seems a little extreme to me. The engine lost it's spark at one time, but after they cooled down the spark returned and the engine ran fine although they began heating up again. Does anyone know what the damage that could be caused if they were bypassed? Or, could I use another coil in this system that requires no resistance?
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Owner, 1977 Porsche 924 Martini Rossi Championship Edition

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

I believe you can dump the resistors and get a Bosch red coil. . .
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

the_mad_electrician · Joined: 16 Nov 2009 Posts: 1073 Location: Central Georgia

I have a 77 and it does not have resistors. The car was like that when I bought it and it works fine, it probably has the coil Rasta is talking about because it is a Bosch.
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81 924 N/A

2004 Ranger "Edge"

2005 Mazda 6

!tom · Posted: Thu Jul 29, 2010 5:52 am Post subject:

Removing a ballast resistor will shorten the life of your coil.
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78 924 NA
5-lug

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

. . .unless it is a hot coil designed to run on 14v.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

StienbargerR · Joined: 28 Oct 2005 Posts: 1362 Location: Richmond, IN

alright, so now I have the same problem. I've got a 78 with the coil resistors. After replacing my starter, and trying to start it, the driver's side ballast resistor cooked. It literally started smoking and was really hot. Is this a symptom of something else? And, if I go to remove the resistors, can I just essentially pull it out and connect the wires?

Ryan

ps- The car will not start also. I had it running fine just a week ago. Im thinking it is not getting spark because of said ailment.
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1978 924 NA
-250lb lowering springs, Euro Pistons

tyfighter123 · Joined: 19 Jan 2010 Posts: 551 Location: Colorado

I have the same problem Im trying to start my car for the first time on the new engine. I had spark for a few seconds and then it went away. The resistor on the right hand side got really hot and there was a little smoke that came from it. Any suggestions"?
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Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

Just a thought, but maybe replace the resistors?

They should be labeled on the side as to their rating.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)