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Re: [FOT] tr3 alternator/negative ground

Subject: Re: [FOT] tr3 alternator/negative ground
From: Tony Drews <>
Date: Tue, 21 Feb 2006 22:00:24 -0600
Ken, haven't seen any responses to this, so I'll jump in.
I'm not sure what changes have to be made to the starter when going 
from positive ground to negative ground.  If you buy one of 
Shumaker's gear reduction starters, that problem's solved.

Of course, ground the negative side of the battery.  If you are 
running the ammeter, you'll need to reverse the wires to it, I think.

Take the generator bracket off of the side of the motor, and plug the 
holes with bolts and sealant - they go through the block and will 
leak if left open.  Use a one wire alternator of some sort (most use 
the GM, but some use little japanese ones).  Bottom attaches to the 
front of the front plate where the old generator mounted.  Put a 
strap from the front of that bolt to a water pump bolt.  You may have 
to saw a bit off of the alternator to make the pulleys line up.  Mine 
needed about 1/4" - GM one wire alternator.  Use stock upper 
adjustment strap.  Put oversized pulley on alternator so it doesn't 
spin too fast and burn up the bearings.  (Moroso or something)

Buy narrow pulley arrangement (crank and water pump) from 
Gillanders.  Run the narrow belt.

Have master switch either cut off ignition or alternator wire.  Mine 
does the alternator wire.  I prefer that to the ones that cut off the 
ignition.  But I've heard strong arguments in favor of the opposite.

May have to swap wires on the coil primary so that plus is on the correct side.

The factory radio won't work in this arrangement.  :)

- Tony Drews

At 05:01 PM 2/18/2006, wrote:
>fot, what's the advice on changing a tr3 vintage racer to an alternator and
>positive gnd?
>e.g. do you stay with the fat belt, what do you do for a mtg bracket, what do
>you have to change other than the cables to the battery terminals? thanks for
>any advice. ken m

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