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Elec. conversion help...

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J

JordanB

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My '67 B has been converted to a single 12V battery, keeping the positive ground.

Now I am considering converting to negative ground. All the references I have found for doing the ground conversion take you from dual 6V's to the negative ground.

What whould have typically been done to convert to single 12V battery?
What(after this has been done) would need to be done to go to neg. ground?
 
go here:

https://www.vtr.org/maintain/negative-ground.html

note: a single 12v battery is exactly the same as two 6 v batteries in terms of conversion.

On a single bat system, one of the terminals is grounded and the opposite terminal goes to the solonoid.

On a dual bat system, one of the bat terminals is grounded and on the other bat, the opposite terminal goes to the solonoid (of course, the two bats are connected, plus to minus)
 
Yep, this is actually pretty easy. You just need to swap out the terminals on your one battery. (Right now, you have the positive terminal cable bolted to the frame as the ground, with the negative terminal providing the juice to the starter, &c. Just figure out how to swap those. (You may be able to just turn your battery around, or you may have to buy a longer grounding cable. You can always move the battery to the other battery compartment, if that helps.)

Then just follow the conversion instructions in the Moss catalog. (On page 151 of latest book.)

It's just a matter of reversing the wires to the coil and "flashing" (re-polarizing) your generator. And you'll have to check your fuel pump -- original ones weren't polarity sensitive, but chances are you have a later model replacement one that is positive ground. (Should have a red banding tape around it.) You'll have to replace it with a negative ground.

The trickiest bit is changing the electric tach. You should have an electric tach, not a mechanical one. (It will just have wires going to it, not a thick cable. And there should be a white wire "loop" in the back.)

Good luck! (So far, I've kept my66 B positive ground...)
 
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