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drolston · 03-22-2017, 08:47 PM

I converted my '41 coupe to 12 volt negative ground. Used Runtz converters from Speedway for the instruments. No need to change the gauges themselves. Pretty easy to install, and have been working fine.

The horn is the trickiest. The horn relay must be changed, and that is not a big deal. But I have found no way to reduce voltage to the horn itself for which the horn still works. The horn actually works on +12 volts but sounds more intense. It might burn out if you laid on it too long.

If you stay with the flathead, the -6 volt starter will work on +12 volts, but might not last. There is an easy way to convert the existing starter to 12 volts by using the field coil part (the outside) of the starter from an FE series motor of the early 60's. The new starter donor should cost under $50.

03-22-2017, 08:47 PM	#4
drolston Senior Member Join Date: Jun 2014 Location: Williamsburg, VA Posts: 1,811	Re: 12v Gauges I converted my '41 coupe to 12 volt negative ground. Used Runtz converters from Speedway for the instruments. No need to change the gauges themselves. Pretty easy to install, and have been working fine. The horn is the trickiest. The horn relay must be changed, and that is not a big deal. But I have found no way to reduce voltage to the horn itself for which the horn still works. The horn actually works on +12 volts but sounds more intense. It might burn out if you laid on it too long. If you stay with the flathead, the -6 volt starter will work on +12 volts, but might not last. There is an easy way to convert the existing starter to 12 volts by using the field coil part (the outside) of the starter from an FE series motor of the early 60's. The new starter donor should cost under $50.