Question about 1990 Dodge D150

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I have a 1990 Dodge d150. im trying to find the ballast resistor. i was told it is located on the firewall next to the coil~ but i can't find it. did they moved it?

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Posted on Jan 02, 2017

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SOURCE: does a 1987 dodge ram 100 have a ballast resistor?

yes it is in one of two places.The first is look under the hood find the blower motor on the left side standing infront of the van.look under the blower motor to the right and down it should be there.if not look near the center/rear engin compartment,to see if it is there.It is a white ceramic part about 2/3 inches long with twqo wires on it.

Posted on Jul 23, 2009

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chiquititas
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SOURCE: turns over but won't start

Is the rotor turning in the distributor? If so, most likely the problem is in the madnetic pickup in the distributor. If not, pull the distributor out and see if the gear on the shaft is broken. A good gear on the distributor and the distributor not turning means you need a timing chain!!!

Posted on May 15, 2008

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SOURCE: I need to know where

does not have one for ignition system

Posted on Apr 30, 2009

jmgldsmth
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SOURCE: 89 dodge d150 no fire

a pickup coil is a reluctor it consists of a magnetized ring near a magnetized pole piece the magnets oppose each other's magnetic field (relucting) signaling the coil pack ignition transistor to fire.
so check with a meter to see if you have voltage to the ignition module as it usually fails before the coil packs or the reluctor assembly

Posted on May 24, 2009

  • 1 Answer

SOURCE: Ballast Resistor re-wiring '87 dodge Ram 50

I have just wired the ballast to the coil on my 84 D-50 all but two wires...is yours fixed yet or still need help?

Posted on Sep 30, 2009

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1 Answer

I'm trying to find an ignition wiring diagram for my 1977 dodge melmar fargo f40 rv


The ignition circuit should be the same as any 1977 Dodge truck, which is basically battery to ignition switch, start side of switch bypasses ballast resistor and goes directly to coil, run side of switch goes to ballast resistor (on firewall) and then to coil. This is done so that you have full 12 volts to coil when starting thus giving higher voltage to plugs to start, but lower amps, but when running you go through the resistor to get lower volts (about 7) to coil to increase amps for a fatter spark and better fuel economy.

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The ballast resistor is a white block with two or four wires mounted on the firewall. The resistor would kill power to the coil if it failed, but it would not prevent the engine from cranking.

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1990 Dodge Ramcharger won't start. Battery output 12v, voltage across coil terminals 6v, voltage output at coil port to coil wire 6v, voltage of coil wire output to distributor 6v. Engine will c


There should be a small white ceramic block on the firewall - this component cuts the battery voltage from 12 to 9 volts for the coil and ignition system. It has 4 wires and is called a ballast resistor.
You may need a book with the wiring diagram to be able to test it. You should have battery voltage going in and something like 9 volts coming out.
You can also run a wire with a fuse from the battery to the positive side of the coil to check the system. Disconnect the factory wire from the coil first.

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1 Answer

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1986 dodge d150, 318 cu engine Truck starts sometimes, could idle for an hour or longer then just quits, not like a fuel problem quits no sputtering just dies like turning the ignition off. Coil is good...


Check your ballast resistor, they are a major failure item. The ballast resistor lowers the voltage to the coil and uses resistance to do so. Test would be to put battery voltage to positive side of the coil, during the failure condition, but my bet is resistor.

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I have a 1985 Dodge Ram Charger. I am trying to replace the ballaster resistor and can not locate it. The book show it on the firewall or fender wheel however it is not located any of those places....


Should be on the firewall,yes. Perhaps follow the wire from the coil back to the ballast.
I assume the truck fires then dies as soon as you let off the starter? That's how a bad ballast would act.

Jan 17, 2011 | Dodge Ramcharger Cars & Trucks

1 Answer

No voltage at coil


Check the ignition resistor mounted on the firewall. It will be white in color with two terminals. One terminal coming in from ignition switch and the other going to the coil. Check the ignition side for fire with the key on, if you have fire there then check the coil side of resistor. If you find no fire on the coil side replace the resistor and that should take care of your problem. Hope this will help you.

May 25, 2010 | 1990 Dodge D150

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