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Post by bluerocket on Feb 28, 2006 12:52:58 GMT -3
As some people know I blew my balast resistor on the toys for tots run. After replacing it with a new part I thought all was good to go. Blew out the replacement today on 95 south during rush hour. Any ideas why it would have blown after 3 months? It was replaced with a mopar resistor not some aftermarket junk.
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Post by axle on Feb 28, 2006 16:09:54 GMT -3
Clean connections, ground?
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Post by rich on Feb 28, 2006 20:24:41 GMT -3
i had one of those on my 74 plymouth valiant had the car for three years and kept 4 of them in my glove box just in case never had use one. i know if i didn't carry one i would need it
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Post by jeeptech on Feb 28, 2006 21:08:04 GMT -3
Fuel pump is over drawing current and burning them out. High resistance in circuit or high resistance against the armature.
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Post by jeepgod on Feb 28, 2006 21:09:22 GMT -3
bobby, the thing is you should not have one in the first place. so my question is why do you and when it went bad the first time why did you replace it? they were never intended to be used with "higher" energy coils / ignitions.
and like rich said they go bad ALOT! so if you leave it in there just be prepared to swap it out.
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Post by jeeptech on Feb 28, 2006 22:37:50 GMT -3
The resistor is used for the fuel pump, on jeeps. Chrysler used it for their ignition systems. they used both a dual resistor and a single resistor. The single was used up to 1972, with a points distributor to reduce the voltage to the ignition coil during normal running. The dual was used in 1973-up when electronic ignition was introduced, one side was for the coil and the other for the electronic module. The MPI fuel system in the jeeps use an E-coil that has it's voltage dropped through the PCM during normal run condition.
The fuel pump gets full voltage during cranking and WOT , it by-passes the FP relay and the resistor and gets it's voltage from the starter relay.
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Post by bluerocket on Mar 1, 2006 0:53:43 GMT -3
I'm running a 89 cherokee fuelpump and tank in my 92, think that could be causing the problem? When the resistor fails it actually cracks in half.
Todd: I dont know, untill i understand fully what it does/why its there I plan on running it as to not cause other problems. I guess i'll pickup a spare one to keep in the glovebox.
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Post by jps4jeep on Mar 1, 2006 14:25:21 GMT -3
after market fuel pump and regulator...
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Post by bluerocket on Mar 1, 2006 19:42:32 GMT -3
Well i mean i could just keep replacing them its only $20 a year in resistors, however I want to figure out whats wrong.
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