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Cloud_Dancer's avatar
Cloud_Dancer
Explorer II
Jul 27, 2016

(FINAL Update )...Alternator voltage too high, question

Mine is a 2003 Spartan chassis, 8.3 350HP Cummins engine, Leece Neville HD alternator with integral voltage regulator. It set at the lake for a month, hooked up to shore power, and I went to check it out, cranked right up, but but the dashboard voltmeter started showing 14.5 to 15 volts. I had never seen this before. I checked the 6 years old house batteries, one was weak, replaced all 4 (golf cart 6 volt). NO change. Tried it with shore power disconnected, no change.
Question: What's the best guess? Change the 2 chassis group 31 batteries, or is it the voltage regulator? Thanks
  • MEXICOWANDERER's avatar
    MEXICOWANDERER
    Explorer
    Jun 23, 2017
    Was not meant for you :) I should have said this plainly. Sorry. Read up on how to FULL FIELD your alternator to positively isolate reg failure from alternator failure.

    OEM Leece-Neville voltage regulators were so unreliable I used Transpo voltage regulators instead. So don't feel bad. I replaced working OEM LN regulators for drill when rebuilding.

    Given today's MOSFET devices and surface mount protection devices, it takes a lot of foresight and planning to make an inferior voltage regulator. You bet your butt, it is intentional. A shield of course is the modern rebuilding shop whose reputation depends on winnowing out the junk.

    These people are rebuilder's suppliers. Their recommendations will not steer you wrong...

    ROMAINE ELECTRIC - WASHINGTON. CORPORATE HEADQUARTERS. 8811 S. 208th St. Kent, WA 98031. Phone - 800-426-5005

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