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Old Pokey

12/24 volt series/parallel switch

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I'm looking for a switch to take two 12 volt batteries and in one position, give 12 volt output in parallel. And in another position, give 24 volt power in series. Does anyone know what these switches are called now days?

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Old Pokey

Are you looking for something to run a

24 volt starter and 12 volt lights and

assesories? If so go to a truck wrecking

yard, most old pre 70 model diesel trucks

have them. Most truck shops have one

laying around.

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Old Pokey I just bought one last friday for my truck it is a Bosch unit Part# 0 333 300 003. They only supply 24 volts to the starter when you turn the key and everything else runs 12 volt. The Alternator also still charges them at 12 volts as well. I hope this helps.

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Old Pokey,

It's called (imagine that) a "Series Parallel" switch.

Cole-Hersey makes them; I'm sure other companies

have them also. This is an electrically operated switch;

if you're looking for a manual switch, I don't know if one

is available, although it probably is...

T 20

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Wow, thanks guys. This is excactly what I'm looking for.

I always thought I heard it called a "series/parallel switch" but so far at the auto parts I have'nt had any luck with that explaination. Now I have a part# from 53T to look up. Thank you very much.

I'll tell you why I'm asking. A poster on Agtalk is wishing to use two batteries in series to run a welder with and in parallel to run a different device with. A lot of fourwheelers and rock crawlers need these portable welders for repairs on the trails.

I will tell him to come here now and check out this thread.

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GM Part # 1119845 Switch

Wilson Part # 61-01-3555

There are more sources if you do a search on the net.

Price varies from $60-$135.00 depending on source and how high you buy on the food chain.

Auto parts store parts people won't have a clue, a Heavy Truck/Equipment Shop is probably your best bet, instructions usually come with the switch.

Used to use quite of few of them years ago when I was converting the older deere 24V starting systems to charge properly.

Just follow the instructions very carefully and use good quality wiring and circuit breakers.

There is significant potential for series burns and damage with 24V systems so be aware.

Doc

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