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1 wire alternator help

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Andy in Ohio

12-08-2004 11:35:16

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I hooked a 1 wire alternator to an M. Problem, it seems to be draining the battery over several days. Is there any way to stop this from happening? Thanks, Andy

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Mark in Mi

12-09-2004 06:22:00

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Re: 1 wire alternator help in reply to Andy in Ohio, 12-08-2004 11:35:16

I put a one wire alternator on my M that I bought from Napa (Knights Auto). Never had a problem. I would exchange it for another.

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souNdguy

12-08-2004 17:32:28

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Re: 1 wire alternator help in reply to Andy in Ohio, 12-08-2004 11:35:16

You could also install a high amerage diode inline with it.. but then that makes a small forward voltage drop.. not a real big deal on a tractor though. Most junkyards have 'tested' delco 10-si alternators for 25 bucks.. and I've seen reman's from auto zone for 19.99.. by telling them you have a 67 chevy truck.

These are 3 wire jobs.. bit stud to battery ( or ammeter.. etc.. ) p1 to switched excite.. like an accy tab inthe ignition.. or a dioded off a 2 pole ignition.. or at worst.. and 'idiot' lite.. ( marker lamp). P2 is remote sense. Ideally this is hooked up to the battery to make up for voltage drop in the lines between the alternator and the battery, like you might see in an automobile.. however on a tractor.. it is acceptable to simply jump p2 down to the charging stud.

Soundguy

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Bus Driver

12-08-2004 18:48:01

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Re: 1 wire alternator help in reply to souNdguy, 12-08-2004 17:32:28

67 Chevy would almost certainly have a separate voltage regulator. By 1974, Chevy's had the internal regulator alternator.

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souNdguy

12-09-2004 04:23:31

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Re: 1 wire alternator help in reply to Bus Driver, 12-08-2004 18:48:01

That may be.. however we aren't in 1967 right now either, and they are not going to hand you an alternator that needs the external regulator off the shelf while at the autozone counter. They are going to hand you what it crosses to as a 'will-fit' generic equivalent.. which will be a 3 wire delco 10-si variant....

Soundguy

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BIG JOHN

12-08-2004 16:33:36

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Re: 1 wire alternator help in reply to Andy in Ohio, 12-08-2004 11:35:16

If your tractor has a distributor you can put a relay switch in the alternator line that will disconect the alternator when you turn the tractor off and back on when you start the tractor. With a mag about the only thing you can do is put a manual switch in the alternator line.

GOOD LUCK

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Mike S 806/H

12-10-2004 12:02:52

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Re: 1 wire alternator help in reply to BIG JOHN, 12-08-2004 16:33:36

For a tractor with a mag I used a oil pressure switch works great.

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Richard Fazio

12-08-2004 14:47:28

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Re: 1 wire alternator help in reply to Andy in Ohio, 12-08-2004 11:35:16

Andy, The alternator should not drain the battery. It may be the way you have it hooked up. Is it a true one wire or do you have an idiot light hooked up also. Here is a good discription of the wiring that I used writtin by Bob Melville in an article on this board. There is also a wiring diagram.

Bob Melville's Article

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Bob M

12-08-2004 11:44:05

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Re: 1 wire alternator help in reply to Andy in Ohio, 12-08-2004 11:35:16

Andy - That's a problem with many of the cheaper 1 wire alternators! (They "leak" a small amount of current when shut down....) One solution is to swap it for another 1 wire unit and hope the new one leaks less current than the one you've got.

Another solution is to install a manual isolation switch in the alternator line, or install a master switch in a battery cable. But NEVER open the switch with the engine running or you will be buying another alterator when the one you've got self-destructs!

Or you can swap the 1 wire for a traditional 3 wire unit - properly wired up of course.

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Doug in OR

12-08-2004 17:51:20

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Re: 1 wire alternator help in reply to Bob M, 12-08-2004 11:44:05

You bring up a point, Bob. The easy route isn't always the best. Really, there's nothing difficult with connecting a 3-wire alternator. And your instructions here in the 'info' section makes it even easier.

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