Posted by henryv11 on June 24, 2014 at 05:49:03 from (71.23.132.102):
This was posted on another site though maybe you could help
Converting my relatively stock 32 Model B 4 cal to 12v neg ground with single-wire alternator.
I have a 12v resisted coil from Napa, 12v bulbs, 12v distributor condenser, etc. No electric to gauges to worry about except dash light. Need to buy a higher capacity ammeter than the original 20 amp.
I'm trying to use a new original wiring harness I already had, and I'm going a little crazy in my hot garage trying to figure it all out since the printed diagram doesn't match the actual loom wires exactly(I think the diagram is more virtual then actual. The truck has been apart for years, so no existing wires to trace paths.
Attached is the service bulletin wiring diagram for the 4 cyl. I've got most of it figured out except for replacing the generator with the alternator.
Questions: 1. Does the new alternator single terminal get all the wires in the diagram that lead to the generator cutout? That is the YB back to the ammeter; the YR to the main light switch BATT; and the Y to the 12v horn?
If so, does the alternator charge the battery through the circuit running back to the ammeter and to the + side of the battery?
2. My 20 amp ammeter has the pass-through type of connector, not separate terminals, but my wiring harness has terminal connectors. I assume most/all new ammeters will have terminals? Is a 30 amp ammeter enough? I have a Nu-Rex 12v neg ground alternator, but it's been years since I bought it and don't remember the specs. Probably 60 amp max output or something.
I think once I know what to connect to the alternator, I can use a meter to trace the connections through the wrapped wiring loom to make sure I've got it all straight.
By the way, if it makes any difference, I have the foot starter rod, not the pull cable, so my starter switch mounts on the rear of the steering box and has two heavy gauge terminals on the underside.
Anyone willing to jump in? Also, please...let's not hijack this as to why I should stay on 6v +grnd. :-)
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