converting a 12 volt alternator to a 6 volt positive ground

[pickup]

I watched Paul Shinn's video on changing a 12 volt Alternator over to a 6 volt Positive Ground. I purchased the kit and installed it. When I put it on the car it blows the 30A fuse when you install the fuse which tells me there is a short in the Alternator.

Can anyone tell me what to look for when I disassemble the alternator to pinpoint the short? I feel I put it together correctly.
Also this is an alternator I picked up at a yard sale but it looked OK.

With the wire off the Alternator, can I connect a test amp meter or volt meter to the one pole and test it for short or if it is putting out?

[Bob C]

Maybe the diodes are backwards.

[P.S.]

I agree with Bob C. Sounds like the diodes are backwards, or perhaps they sent you negative ground diodes by mistake.

[rotorwrench]

I don't know how many outfits put these kits together. Quality control may not be all that good. The diode bridge should have identification on it. They use a jumper wire as well. The GM 10si is the most common unit. I've not done any others.

[Kurt in NJ]

Some I have seen the diode group is isolated from the case and a jumper to the case is used to make either positive or negative ground, the regulator determines the voltage

[Badpuppy]

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Positive and negative ground use the same regulator. Negative screws directly to the case, positive uses insulated screws, and jumpers the negative side to the output. You may have omitted the insulators.

[w.michael]

If the alternator was good, why was it at a yard sale? I would say it is a core for trade-in on a rebuilt alternator. Take your kit out, trade the core in on a rebuilt alternator, and then re-install your kit in the rebuilt unit. This assumes you did not fry the kit by installing it the first time.

W. Michael

[oldspert]

I looked for the kit to do this, but none of them have the pulley necessary for the wide belt used on the Model A. Anybody have a source for the pulley only?

[rotorwrench]

A person would likely have to purchase a wide belt pulley separately. They are available.

[Bob C]

Originally Posted by oldspert

I looked for the kit to do this, but none of them have the pulley necessary for the wide belt used on the Model A. Anybody have a source for the pulley only?

I think most of the vendors have them.

https://www.snydersantiqueauto.com/p...6053&cat=41710