Question about 2002 Dodge Durango

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Ballast resistor keeps over heating why - 2002 Dodge Durango

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Usually a bad blower motor does that

Posted on Sep 01, 2010

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1 Answer

Does a 1951 Plymouth Cranbrook have a primary resistor that has to do with starting the car?


Older cars had a ballast resistor to limit the voltage to the ignition coil in order to prolong the life of the coil. The way it was set up, when the starter was engaged, the ballast resistor was bypassed, providing full voltage to the coil for a 'hot' spark. Once the engine was running, current to the coil was routed through the ballast resistor. I think this was usually accomplished in the ignition switch - full power in 'Start' position, through the ballast resistor in the 'Run' position.

Nov 25, 2016 | Plymouth Cars & Trucks

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318 engine with no spark to coil or spark plugs. how do i fix this


William, your car uses a ballast resistor that causes what you describe. This is usually a ceramic white, rectangular piece, mounted on the firewall.
The voltage to the coil has to be dropped to 8 volts, or so. Chrysler handles that with a ballast resistor and it fails.
To test, you can wire across the resistor and see if you have spark.
My recollection is one side is for the coil and one side for the wipers or something like that.

This is a common problem.

Dec 27, 2014 | 1987 Dodge Ram 50

1 Answer

1965 falcon sedan resistor


Ignition ballast resistor is usually mounted on the firewall near the back of the engine. It's white, rectangular, and has a wire connector on each end. It's function is to limit primary coil current during engine running. The ballast is bypassed during starting so you get a higher spark voltage. If you remove the ballast, you will burn out your coil.

Feb 23, 2014 | Ford Falcon Cars & Trucks

1 Answer

I have a 1985 plymouth gran fury that has no spark. I replaced coil and test for proper volts. Replaced Distributer cap and rotor, new pick up, new plugs, new ECU mounted on air box, tested fusible links,...


Check out this site: https://www.allpar.com/forums/topic/40994-ballast-resistor/

Seems to be some debate as to whether or not your car even has a ballast resistor, and if it does, where it may be located. I've always seen ballast resistors mounted on the firewall away from the engine's heat...but those were on older models (50's, 60's 70's). Good luck.

Oct 08, 2013 | Plymouth Gran Fury Cars & Trucks

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I dont know how the engine ballast resistor look on 99 nissan maxima


What code did autozone say you had. Ballast resistors have been used in cars since the late 1970's.

Apr 02, 2013 | Cars & Trucks

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1984 dodge ram charger will start and stay running if the ignition is held in the on position but as soon as it is released it dies. what would cause this?


Hi, the usual cause of this is a failed ballast resistor. You can find it by tracing the pink wire from the coil. I have pasted a picture of your ballast resistor below the wiring diagram. Try bypassing the resistor by putting a jumper wire across the 2 terminals. If this works to keep it running, replace the ballast resistor.

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Jun 14, 2011 | Dodge Ramcharger Cars & Trucks

2 Answers

Keep burning up coils on a 1990 Dodge Ram Van 2500 with a 318 motor.


there should be a white ballast resistor in the circuit to cut the amperage back on the coil.
Check or replace ballast resistor sometimes they was mounted on firewall next to the ignition module either a 2 prong or 4 prong white ballast resistor.

May 18, 2011 | Dodge Ram 2500 Cars & Trucks

1 Answer

Re fitting a Bosch GT40R-T ignition coil to a Ford V8


The ballast resistor only weekens the power to the contact points while the engine is starting after that the secondary wiring "is" a built in resistor. I suggest you use the ballast or you'll be changing a lot of point sets.Just out of curiousity, why would you want to convert back to an older and proven obsolete type system?

Aug 25, 2009 | 1979 Ford F 350

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1988 jeep comanche will start only when you hold tumbler in the start position, when you relese it, engine stops.. engine is a 4.0 auto, fuel injected 4x4


If the car has a resistor coil with a ballast resistor to drop voltage from 12 to 8 then check the resistor wiring. When you engage the starter tumbler it by passes the ballast resistor and sends 12 volts straight to the eight volt coil to get good spark. When you release it the 12 volts goes through the resistor to 8 volts and then the coil. If there is a fault in this circuit the engine stops. Jump the 12 volts straight to the coil and start it. If it keeps going the ballast circuit is faulty. Paul

Jul 27, 2008 | 1986 Jeep Comanche

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