Re: A Bob M or anyone else charging ?

Posted by Bob M on November 14, 2001 at 12:24:29 from (165.170.128.66):

In Reply to: A Bob M or anyone else charging ? posted by Paul Shuler on November 14, 2001 at 11:14:21:

Hey Paul - Same thing happened to my Super M while at a tractor show a couple years ago. Problem turned out to be the an intermittant malfunction in the alternator's internal regulator. Replacing the regulator solved the problem.

Testing for a failed regulator is simple: Look for a 1/4" dia hole in the alternator end bell. About 1/4" inside this hole find a short metal tab. You bypass the regulator by taking a screwdriver and CAREFULLY inserting it to ground the metal tab to the end bell with the motor running at full RPM. If the alternator charges with the tab grounded, you know the regulator is bad. (If it does not charge with the tab grounded, the problem is elsewhere - bad brushes, failed diodes, open winding, etc)

The regulator is easy to replace in place - you don't need to remove the alternator from the engine. First remove the ground cable from the battery. Then take out the three long cap screws the holds the end bell onto the alternator. Now carefully pry end bell off. Inside the end bell you'll find the regulator - the small white plastic device with 4 connections. Simply undo the connections and swap out the bad regulator. Finally reverse the process to reassemble. (Tip: Before you replace the alternator end bell, push both brushes all the way into their holders and temporarily hold them in place with a straightened paperclip inserted in the holes provided in the end bell and brush holders. Then after the end bell is bolted back on, pull out the paper clip out - the brushes will drop onto the slip rings and you'll be set to go).

Find a regulator at NAPA, any starter and alternator shop, etc. Last one I bought was about $10. Also it's a "one size fits all" regulator for all Delco 10SI and 15SI alternators.

Good luck!! Bob M...

Follow Ups:

• Re: Re: A Bob M or anyone else charging ? Paul Shuler 16:28:36 11/14/01 (1)
  • Re: Re: Re: A Bob M or anyone else charging ? Bob M 17:18:50 11/14/01 (0)

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