1972 Ford F100 Alternator/Voltage Regulator wiring
I have a 1972 Ford F100 w/302 engine. The original 6-cyl engine was replaced by the 302 before I bought it. It was re-wired prior to when I obtained the truck. It has never seemed to charge correctly. I don't think it was re-wired correctly. There are no markings on the voltage regulator & this is where I think the problem begins. Currently it is wired like this:
1. From alternator ''Bat'' to battery side of start solenoid
2. From alternator ''Fld'' to 1st position on voltage regulator
3. Nothing connected to ''Sta'' on alternator
4. No ground running from alternator to voltage regulator
5. From the 2nd position on the voltage regulator to start switch
6. From the 3rd position on the voltage regulator to battery side of start solenoid
7. There's a condensor at the voltage regulator that may have been connected to the 3rd position at one time
8. The truck has an ammeter but has been disconnected but seems to me it should have been in the circuit.
Searching the Internet only proved to be confusing - sites contradict each other and wire color code don't match.
I'll greatly appreciate any help you folks can provide.
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I guess my first question would be - what are your plans for the car ?
Totally stock, modified, or race ?
Totally stock would be the most valuable in terms of resale. Modified or race would limit the number and type of possible buyers.
It had a straight 6 cyl 250 - a 350 V8 - or 400 V8 when new. The VIN would tell you want the original engine was. And this was before GM swapped engines between brands. So the V8 engines were Pontiac built. The Pontiac 6 cyl was overhead cam.
Firing order is stamped on the block intake manifold or label. 4 cyl are typically 1324
From the web: The
firing order for four cylinder engines where the cylinders are in-line
is 1243 or 1342.
are the only two possibilities I've ever found for inline four
cylinder engines. In practice, it's almost always 1342, except
for Ford engines which are 1243.
Take one off at a time and replace it
Do not run the wires parallel (side-by-side) for more than 6". Cross them over each other wavy-like if needed. This will prevent crossfire.
Replace Points, Plugs, Condenser, Rotor and Cap too.
You are mis fireing on cyl 1 and 3 if you replaced plugs and wires and coil this is going to be a fuel injector issue or valve issue. See if you can swap the injectors with known good cyl. and see if it changes. Or have a shop do a fuel injector service on it to see if it helps. It may be to late for the fuel injector service.