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Old 06-26-2005, 03:03 PM
Early Iron or No Iron
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Help!Please!No coil voltage Dodge p/u

I have a '84 Dodge 1/2 ton with the leaning tower of power and Chrysler's "advanced" version of the stinkin' Lean-burn setup.I shut the ol' girl off during a torrential downpour last weekend,and it wouldn't restart.I ran through the usual diag,no spark,and nothing at the positive side of the coil.I ran a jumper from the battery to the coil and she fired right up so I could at least get it the 10 blocks home.More tests per the factory service manual indicated power to the ign switch,but nothing out to the coil.I replaced the ign switch,same thing.The tests indicated the module was good,but I tried two others anyway (by this point,I am MUCH balder than when I began).I enjoy a good mystery now and then,but I like to know there's an answer at the end.One of you guys has got to have a couple more ideas,I'm out.Please help before I light this thing on fire.

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Old 06-26-2005, 08:48 PM
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Coil Power

Doc here,

Dude, The Butler did it.....

Not familiar with that version of the system, BUT let's try Some generic troubleshooting...

Does that have a resistance wire, or Coil resistor...If so with a volt ohm meter, read power on each side of it..Should be 12 volts coming from the Ignition switch side and 6 to 9 on the coil side..If you have 12 volts and 0 on the other side, then It's open...replace the resistor or wire.

If you have NO 12 volts...back track that wire until you find 12 volts...Or at the Ignition switch, whichever occurs first...replace that which lies between...

Do you have a fuse inside or under the hood Marked ECM, Coil or Computer? Check those...

By virtue of the fact it runs in "Bypass Mode" shows that the Ignition is functioning...just not receiving power...

Try those and let us know what you find...

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Old 06-26-2005, 08:54 PM
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if it has a (dont quote me)ballast resistor its probably fried. its a ceramic looking thing that drops the voltage so it doesn't burn up the ignition system. should be on the firewall .
yea mysteries are ok when its not your daily driver


"Illegitimis non carborundum"
Don't let the bastards grind you down!

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Old 06-27-2005, 09:04 PM
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Thanks guys!

Well,despite showing voltage at the hot feed to the ign switch,the fusible link protecting it failed the "pull test" (ie:it stretched like a rubber band).I swapped it and it's alive!As a note,I also repaired the exposed wire at the bulkhead connector which caused the fuse link to burn out.I mention this for those who read these posts to learn from (like I often do).Never just replace a burnt fusible link (or fuse for that matter) they burn up for a reason!Also another note,these trucks (and vans of the same era) do not use a ballast resistor,that function is contained in the control module Having said that,Rob,you are bang on in mentioning it as a likely culprit,being a veteran of many old Mopars,I ALWAYS carry one in the road toolbox (Ma Mopar offered two varieties,a 4-prong and a 2-prong,the 4 will work in place of a 2,but not vice-versa).Anyway,once again,Thanks guys!
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