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6 volt question

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Category: Other Topics
Forum Name: Shops, Barns, Varmints, and Trucks
Forum Description: anything you want to talk about except politics
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=208909
Printed Date: 30 Dec 2025 at 12:28pm
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Topic: 6 volt question

Posted By: ACinSC
Subject: 6 volt question
Date Posted: 13 Nov 2025 at 6:02pm

If a 12 volt battery is used to turn over a 6 volt car engine will it fry all the 6 volt bulbs fuses, etc? Thanks

Replies:

Posted By: Clay
Date Posted: 13 Nov 2025 at 6:32pm

12 volt battery used on 6 volt bulbs would be brighter and burn out sooner then with a 6 volt battery.

Voltage reducers, 12 v. to 6 v., will be necessary to prevent 6 volt gauges, wipers, radios and accessories from overload.

Fuses don't care about the voltage, it is the amps.

Posted By: steve(ill)
Date Posted: 13 Nov 2025 at 10:07pm

when you jump a 6 volt system with a 12v battery... You leave the light switch and radio OFF... YES, they will burn out if you turn them ON... If the switch is OFF, there is no problem... If your talking about upgrading to a 12v system, then YES, you need to change out the bulbs, etc.... The ignition coil will be short lived if you run a 6v coil on 12 volts for any length of time... If your JUMPING to get it started, then running off the old 6v battery, that is OK... If you leaving the 12v battery connected, then you should install a 12v coil... Starter dont care.. Generator will work on a 12v system, but 6v voltage regulator may not cooperate.

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Like them all, but love the "B"s.

Posted By: steve(ill)
Date Posted: 13 Nov 2025 at 10:11pm

remember, most 6v systems are POSITIVE GROUND... .. if your jumping with the 12v battery, you should follow that plan.

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Like them all, but love the "B"s.

Posted By: ACinSC
Date Posted: 14 Nov 2025 at 5:53am

Thanks guys. Good info! Just want to see if the engine will turn over.