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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

24 volt starter hook up

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Billy Heddin

05-01-2005 17:22:38




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Hello, I would like to know how to install a wiring system on my '49 D-6 Cat. It has no electrical of any kind on it now. Well, the pony motor has a 12 volt battery, but the magneto on the pony motor keeps it charged. I have installed a one-wire 12 volt alternator on the motor, and have installed a 24 volt starter. The batteries are ready to go, I just need to know how to run the wires. I was told that on some trucks, the ignition switch, when turned to "start' sends 24 volts to the starter, and when released to "run" it returns to 12 volts to charge the two batteries. I would appreciate any information you can give me. Thanks for your time!
billy heddin "bheddin@prophetweb.com"

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Rob in Yukon

05-02-2005 08:14:28




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 Re: 24 volt starter hook up in reply to Billy Heddin, 05-01-2005 17:22:38  
You would need two 12 v batteries and a series/parallel switch. The batteries are wired in parallel for all but starting. The s/p switch is energized by the starting circuit, making a series connection internally for the duration of cranking. Makes for more complicated circuitry, but I dont know why it wouldn't work on your CAT.
12 v. sealed beams and other accesories are less expensive so may offset the cost of installation.I know guys who have changed over to electric starting when their pup motors are worn out or damaged on account of cost, but your message indicates that you will have both. I'm curious to know why?

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Billy Heddin

05-02-2005 21:16:08




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 Re: 24 volt starter hook up in reply to Rob in Yukon, 05-02-2005 08:14:28  
Hey, thanks for the info! Do you know where I can get a drawing of this? One that shows how to wire the whole thing? I'd sure like to see it on paper. I knew I'd have to have two batteries, and I'd been told by a truck driver about the switch. I didn't, however, ask where would be the best place to buy the switch. I'm using a single wire alternator. Oh yeah, I just forgot to mention in my last posting that I was removing the pony motor. It works fine, I'm not sure what I will do with it. Thanks!
billy

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Rob in Yukon

05-08-2005 07:11:00




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 Re: 24 volt starter hook up in reply to Billy Heddin, 05-02-2005 21:16:08  
I can't think of a book that shows a series parallel application off hand, but I bet you could find something on the net with a search engine. The s/p switch should be available at a truck supply or heavy duty mechanical supply in your area. A couple of other things came to mind after last post. You should also have an ammeter or voltmeter; a heavy duty circuit breaker, bi-metal disc type, in the charging circuit; and most guys want to have a ground disconnect or master switch, so that batteries don't discharge when you are parked for a while. You could find a truck shop and ask a mechanic about arrangement, it's a bit complicated for e-mail. For my two cents, I'd stick with the pup or pony motor if it works well. They can seem like a pain sometimes, but they have a lot of advantages. They were expected to run on white gas or naptha as it is also known. This is to prevent varnish from forming between uses. Most guys I know use regular and shut off the gas while the pup is running then let it run out on what's in the carb.

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Billy Heddin

05-08-2005 16:50:01




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 Re: 24 volt starter hook up in reply to Rob in Yukon, 05-08-2005 07:11:00  
Hey Thanks for the info. My thought is that the pony motor is the way to go, but my dad want's a starter. He's the boss, so, it's off with the pony motor. I appreciate all the answers and info everybody's offered, it's helped a lot. I think we can figure it out now. Probably will just buy a 24 volt alternator, instead of trying to use a 12 volt one. I think this will eliminate a lot of problems. Thanks again!
billy

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