Re: This question is electrical !

Posted by John T on November 12, 2005 at 21:42:37 from (66.244.90.98):

In Reply to: This question is electrical ! posted by Randy-IA on November 12, 2005 at 21:17:21:

Randy, Although I cant say for sure exactly not knowing how someone may have jury rigged your switch n system, if the Alternator is an internally regulated unit, such as a GM 10 SI, it doesnt require any external voltage regulation (it does require an excitation voltage circuit to its lil No 1 side terminal, see below) and WOULD NOT need to be wired to the combination light and field control charging system switch (L H B D) like they used for the old 2 wire cutout relay charging systems.

The resistors in that type of combo regulatign switch suppled EITHER a dead ground for the Gennys Field for High charge and a ground via a resistor on that switch for Low charge. It can still be used as a light switch if its good, but its not needed nor wired to an internally regulated alternator.

I have seen the GM 10 SI 3 wire alternators jury rigged up all sorts of ways to excite their fields/rotor so its no telling what you may have and how your switch and alternator is wired now. When I wire the GM 10 SI I use a 10 ohm current limiting protection resistor and a diode if needed in the excitation circuit, but I usually feed that off the Ignition switches IGN terminal or off the coils high input side. Most alternators are for Negative ground, in which case one has to rewire the coil and swap ammeter leads if it was an original Positive ground tractor.

YOUR SPECIFIC QUESTIONS:

Soooooooooo, NO you do NOT need to adjust the charge rate of an internal regulated alternator.......... It shouldnt matter if its in the L or H position, cuz theres no Generator wired to it, and therefore its resistor (Low charge) or its dead grounding (high charge) positions are of no consequence for your alternator, they were for a generator.

You mentioned a resistor and a coil?????? If its a resistor in series with your Ignition Coil, they may have used the old original 6 volt coil and needed a voltage dropping (12 to 6) Ballast Resistor in series. Its wired after the ignition switch and ahead of the coil if its an ignition ballast resistor.

When I rewire for an alternator that had a genny previously, I replace any 12 gauge wire in the charging circuit with 10 gauge.

Post back any question, good luck n God Bless

John T, retired electrical engineer

Follow Ups:

• Re: This question is electrical ! Randy-IA 07:41:05 11/13/05 (1)
  • Re: This question is electrical ! John T 15:54:42 11/13/05 (0)
• Re: This question is electrical ! SMA in NE 06:16:02 11/13/05 (2)
  • Re: This question is electrical ! John T 15:47:05 11/13/05 (0)
  • Re: This question is electrical ! old 06:47:39 11/13/05 (0)

Post a Followup Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]