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-   -   Alternator conversion - HELP! (https://www.tbirdforum.com/forums/early-birds-1955-1957/4585-alternator-conversion-help.html)

new to this 07-19-2019 11:16 AM

Alternator conversion - HELP!
I normally stay in the "Flair Bird" section. My Bird is a '66 convertible. I am helping out a friend with a '56.

We changed "teapot" carb to Edelbrock using manifold plate adaptor. Changed distributor to electronic style. So far all good.

Used existing ignition wire to coil (removed resistor) to added relay to power new coil/distributor. So far - still all good. Engine runs smooth - starts easier. A few times - the ignition switch would not turn off engine. It did not happen all the time - intermittent. Suspected bad ignition switch - replaced it.

Removed generator. Installed "one-wire" alternator. Added wire from alternator to battery. (Old generator wiring disconnected and isolated - taped up and tucked away.)

Existing voltage regulator still mounted and connected into original wiring.

ISSUE: The generator light obviously stays lit. Applying 12VDC quickly to any of the terminals of the existing voltage regulator turns off "GEN" light. However - now the ignition switch will not turn off car. (Have to remove power to coil/distributor to turn car off) OK, now car is off - ignition switch is in off position - generator light is illuminated. Requires to disconnect battery to turn off GEN light.

I looked through all 26 pages of the forum. And yes, I have a wiring diagram. I am to the point as Clint Eastwood said in the movie "Magnum Force" - "every man has got to know his limitations," I am beyond my abilities.

Requesting help from the forum group. In advance - thanks all.

Yadkin 07-23-2019 10:45 PM

1 Attachment(s)
The "run" terminal on the ignition switch powers the coil (red-green stripe wire to pink resistor wire to red-green strip wire) AND the voltage regulator (green-red stripe). You may be back-feeding the coil through that somehow.

Not sure why you have a relay in the circuit. Perhaps to get 12 volts to the coil and bypass the resistor?

See the attached diagrams, factory and modified.

Then check to see if you have zero voltage at the coil with key off.

new to this 07-27-2019 04:19 PM


Thanks for your response.

Yes, relay was added to make sure there was adequate voltage to electronic distributor/coil. (Fought that battle w/ my '66 Bird)

Your modified wiring diagram will be a big help.

It will be a week before I get back to this friend's house.

I will let you know.

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