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H 12 volt conversion

A

Anonymous-0

Well-known Member
Hey guys. I've got a brother-in law who asked if I know how to convert an H from 6V to 12V. My short answer is to get a car alternator with built-in rectifiers and voltage regulator. I've got wiring diagrams that show the field coil resistor and all that good stuff. What I don't know is what to do about the coil, points, and plugs. Is there a good source for part nos.,specs.,etc..? Can you use the original stuff and just drop some voltage with a series resistor to the coil? Thanks for any input.
 
for the ignition, you can use a ballast resistor for a mid 1970"s b body chrysler, napa has em for about 5 dollars. my h has a 12v conversion that way, and the genny is a 12v from an early 1960 chevrolet. add a 12v regulator and you are good to go.
 
Gary, the points n plugs n condensor are the same...... The coil (assuming its a coil not a mag, if so no changes required) you can keep plus add a series external voltage dropping (12 to 6) ballast resistor after ignition switch before coil as posted or toss the old coil n get a new 12 volt as posted NO BALLAST REQUIRED. Starter can work as is, although it can be a bit tough on starter drive n gears, I would NOT use any heavy rated 12 volt battery but a smaller rated one. Change lights to 12 volts....I usually upgrade the wire from alternator to ammeter and from ammeter to starter/battery to at least 10 gauge, depends on alternators rating.

NOTE if you switch to neg ground the coils wires
+ from switch and - to distributor and the ammeter leads need swapped or it reads bass ackwards

John T
 
I think the resistor is the same on any v-style Mopar up to 93. I asked for one for a 85 pickup with a 318. I'll have to get a picture of how I mounted it. That hole in them sure makes it convenient.
 
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