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alternator wiring - 52 A

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young gun

Joined: 18 Aug 2012
Posts: 90

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PostPosted: Tue Feb 05, 2013 1:54 pm    Post subject: alternator wiring - 52 A Reply to specific post Reply with quote

wondering if someone can help me determine wether I have the correct wiring for the alt on my A. it wasn't charging my battery at all before I tore everything apart; alt is currently at the shop being tested/fixed (if necessary) so figured I would make sure wiring is also correct.

- there were 2 wires coming from the alt; one went to the switch for the lights and the other went to the amp guage...

- from the amp guage (besides the wire to the alt), there was one wire that went to the on/off switch, and the third wire went back to the battery on the negative pole (tractor is positive ground)...

if anyone knows if (A) this is correct and (B) what poles on the amp guage and alt should be sending wires in which direction (in case they are switched) please help me out.

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Joined: 07 Jul 2007
Posts: 1392
Location: Northwest Kansas

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PostPosted: Tue Feb 05, 2013 3:14 pm    Post subject: Re: alternator wiring - 52 A Reply to specific post Reply with quote

What alternator do you have?

A commonly used alternator is the Delco-Remy, which from the factory was negative ground. (It is possible to have one that has been modified for positive ground.) If you tried to install a negative ground alternator on your positive ground tractor it will immediately fry the alternator.

If you have the common Delco alternator the wiring would be:
#2 on plug to large out put stud
#1 on plug to output side of ignition switch with a diode, resistor, or idiot light in the line.
Output stud to one side of ammeter. Light and ignition switches also go to this side of ammeter.
Other side of ammeter to hot battery post.

If you need to switch to negative ground, ignition coil -- (if it has distributor) goes to side post on distributor.

Connect ammeter so it reads negative with lights on and engine not running.
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