12V questions
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Junior User
Joined: Dec 2001
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From: Snohomish, Wa, USA
12V questions
A couple 12V conversion questions- anyone have details on mounting a GM alternator to the flathead 6 ? Also, how are the dash guages handled, with a single reducer for all, or individual reducers per guage?
Thanks!
Nick
Thanks!
Nick
Senior User
Joined: Nov 2001
Posts: 319
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From: Sacramento
I have 12V in a 51F1, but not GM single wire set up. The gas gauge was the only one I cared about, and an electrical shop sold me a resistor(?) to put in the line under dash prior to the gauge. The battery charge/discharge gauge needs no adjustment, doesn't care what voltage going through the line. I use an aftermarket gauge set for oil pressure, water.
New User
Joined: May 2004
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I've used just 1 resistor for all the gauges since their ran in series with each other, as well as a resistor for the ignition circuit "because of the points."
I've done something different tho on the charging & starting catagory, I took my Starter & Genorator to a local repair shop & had them rework them to function as 12V units...
I've done something different tho on the charging & starting catagory, I took my Starter & Genorator to a local repair shop & had them rework them to function as 12V units...
Junior User
Joined: Oct 2001
Posts: 51
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From: Las Cruces
I have a GM alternator mounted on my flathead six. Was not hard to do. First I welded up a bracket that bolted to the stock generater holesin the block. If you can't make up a bracket, you could probably find a chrome universal bracket. I then used an aftermarket adjusting bracket attached to a water pump bolt.
For a pulley, the good news is that the wide belt pulley from the original six volt unit fits and works perfectly with the GM alternator. If you don't have the original, look for a wide pulley at a electrical repair shop.
For wiring, big terminal to battery, another lead to ignition and the third to idiot light.
Hope this helps
For a pulley, the good news is that the wide belt pulley from the original six volt unit fits and works perfectly with the GM alternator. If you don't have the original, look for a wide pulley at a electrical repair shop.
For wiring, big terminal to battery, another lead to ignition and the third to idiot light.
Hope this helps
Thread Starter
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Junior User
Joined: Dec 2001
Posts: 70
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From: Snohomish, Wa, USA
Thanks for the info an the pulley, you are right-the gennie pulley/fan bolts right on! I was hoping to avoid a bunch of fabricating, bracket-wise, but may need to. Also trying not to spend another 35 bucks on a 'universal adapter'.
Nick
Nick
