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EFV-8 Club Forum / General Ford Discussion / 6 Volt to 12 Volt Conversion

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Discussion Topic: 6 Volt to 12 Volt Conversion

baceves

03-24-2015 @ 12:17 PM

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I'm currently switching over to a 12volt system for my 1947 Ford Super Deluxe. I already converted the generator to 12 volt, i replaced the solenoid and ignition coil. I also changed all the bulbs. I purchased all new wiring harnesses for my car.

When i install the cowl dash wiring harness can i connect the wires to the same original circuit breaker (Can the original circuit breaker be used for 6 and 12 volt)?

Drbrown

03-24-2015 @ 6:56 PM

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Previous owner converted mine and kept the original circuit breaker. To my knowledge, the circuit breaker is intended to respond to amperage loads, rather than voltage loads.

baceves

03-25-2015 @ 10:14 AM

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Thanks. I was thinking along the same line.

Drbrown

04-03-2015 @ 9:29 PM

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In a fairly new Ford Barn thread I encountered a modification if you're changing to 12v .... Change your horn relay to a 12v (1956 Ford 12v with screw terminals) and remove the cap on the body of each horn to access the interior points. If the tone(s) are "off" using 12v I understand you can adjust the points to improve the tone.

TomO

04-04-2015 @ 7:15 AM

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Adjusting the points does not change the tone on the trumpet type horns. Adjusting the air gap of the armature will change the tone.

The horns will be much louder when operated on 12 volts and the horn motors will not last as long. You can use a .5 ohm 50Watt resister in line with the supply to the horns to reduce the voltage to 6 volts.

Tom

Drbrown

04-04-2015 @ 7:37 PM

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TomO .... I personally have not had the horns apart yet and someone had mentioned in the thread that he tried resistors without success (didn't describe what was attempted). So Thank you for that resistor info.

PS: Reminder - that during the conversion, (not previously mentioned) gauges and any heater or electric clock, if any, need to be addressed.

This message was edited by Drbrown on 4-4-15 @ 7:45 PM

TomO

04-05-2015 @ 7:32 AM

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He might have put the resister in the pick circuit of the relay.

Tom

Drbrown

04-05-2015 @ 8:21 AM

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TomO .... I plead ignorance re "pick circuit of the relay" but suspect you mean the horn connection side ? Although I now have a 12v relay, if the original 6v relay is working, could one keep the 6v relay by installing the resistor on the power-feed side ?

My stock 6v relay has separate connections for each horn, where as the '56 12v relay has one. If the resistor goes on the horn side, does each horn need a separate resistor ? (Diga-Key site has casing mount resistor for abt $15 each w/tax/mailing)

This message was edited by Drbrown on 4-5-15 @ 11:25 AM

TomO

04-06-2015 @ 7:27 AM

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I am not an expert on converting to 12 volts as I like to keep my cars as original as possible. It make it much easier to solve problems when they occur.

I based the resister size on the basis that a set of horns draws about 20 amps. If you want to add a resister for each horn, try a 1 ohm and measure the voltage on the horn side of the resister.

Tom

Drbrown

04-07-2015 @ 8:32 AM

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Thanks once more TomO. I will connect the horns, both individually and together and measure the amperage draw both ways. This should identify what size resistor would be suitable for the 6v to 12v change either way. I'll post my findings when done.

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