The Ford Barn

Jerryhamlin · 09-04-2019, 01:42 PM

I'm converting my 1940 Ford over to 12 volt. I have the Alternater and alternater brack to flat head v8. I know Regulator is eliminated. What other engine wires go where? Gauges and lights are not an issue now. Thank you for the help.

JSeery · 09-04-2019, 03:37 PM

There are several articles and old threads on doing this conversion. Here is one resource. http://www.how-to-build-hotrods.com/hot-rod-wiring.html

51 MERC-CT · 09-04-2019, 04:14 PM

As stated there are sources of information in various places.
Considering that you are using a one wire Alt. this is a general idea of the one wire hookup and the other issues that need to be addressed.

drolston · 09-04-2019, 04:34 PM

I left the regulator in place and just connected the Armature wire from the generator (now the +12v wire from the alternator) to the Battery terminal on the regulator. I used the former Field wire as a ground, attached to a ground point on the alternator and under the screw that fastens the regulator to the firewall on that end. The alternator should ground okay through its mounting bolts, but that added ground connection is insurance.

19Fordy · 09-04-2019, 05:15 PM

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Jerry: Here's how to make your 40 Ford BAT gauge read accurately when converting to 12V and using a one wire alternator (neg. ground).. You have to isolate the BAT gauge so it operates all by itself and install a 60 OHM resister in line from the 12V input wire to the gauge. See here.
https://www.fordbarn.com/forum/showt...olt+conversion

09-04-2019, 01:42 PM	#1
Jerryhamlin Junior Member Join Date: Jul 2019 Posts: 1	6 volt to 12 volt conversion I'm converting my 1940 Ford over to 12 volt. I have the Alternater and alternater brack to flat head v8. I know Regulator is eliminated. What other engine wires go where? Gauges and lights are not an issue now. Thank you for the help.

09-04-2019, 03:37 PM	#2
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: 6 volt to 12 volt conversion There are several articles and old threads on doing this conversion. Here is one resource. http://www.how-to-build-hotrods.com/hot-rod-wiring.html

09-04-2019, 04:34 PM	#4
drolston Senior Member Join Date: Jun 2014 Location: Williamsburg, VA Posts: 1,627	Re: 6 volt to 12 volt conversion I left the regulator in place and just connected the Armature wire from the generator (now the +12v wire from the alternator) to the Battery terminal on the regulator. I used the former Field wire as a ground, attached to a ground point on the alternator and under the screw that fastens the regulator to the firewall on that end. The alternator should ground okay through its mounting bolts, but that added ground connection is insurance.

09-04-2019, 05:15 PM	#5
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,921	Re: 6 volt to 12 volt conversion Sponsored Links (Register now to hide all advertisements) Jerry: Here's how to make your 40 Ford BAT gauge read accurately when converting to 12V and using a one wire alternator (neg. ground).. You have to isolate the BAT gauge so it operates all by itself and install a 60 OHM resister in line from the 12V input wire to the gauge. See here. https://www.fordbarn.com/forum/showt...olt+conversion