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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

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

1 Answer

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

1 Answer

Faulty Ballast Resistor


When running it goes well but to start needs a jump lead connecting the positive terminal on the battery to the positive terminal on the coil. Without that it just doesn't produce enough voltage at the moment, but when the new coil etc was fitted a couple of weeks ago it was producing what it should I think and started ok for about 4 or 5 times.

I am wondering if it can be related to the ballast resistor.

It is a MK2 car so shouldn't have a seperate one I think but have it incorporated into the loom - am I right? Mine has a seperate one and I am wondering if there is one in the loom too.

Could having a seperate one short / burn out the coil? Any other thoughts?

Oct 20, 2012 | 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

I am trying to get spark to fire the motor in my dodge raider. The ballast resistor and coil had all the wires disconnected. Where do the wires connect back too?


The negative side of the coil goes to ground. The positive side goes to the ballast resistor. The other side of the ballast resistor connects to the ignition switch. More information might be had on manualsonline.com.

Mar 14, 2011 | Dodge Raider 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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