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Re: One wire alternator

not charging

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05-01-2002 08:19:25

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Is it a true one wire alternator or a 3 wire? I normally use a 3 wire (73 up GM), and when I converted my JD backhoe with a known good alternator it wouldnt charge until I wired in the idiot light between terminal 1 and ground. Terminal 2 was wired directly to the alternator output terminal and the battery. If it is a true one wire, somehow the internal regulator has to get flashed with some voltage to get it started.

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Bryan Smith

05-01-2002 09:06:18

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 Re: Re: One wire alternator - not charging in reply to drptop70ss, 05-01-2002 08:19:25  
The alternator has to be turning at 1200 rpm to start charging. No idea what that would be on your engine rpm (depends on pulley diameters as you know).

Check out the Genesee Products link below - they have been a GREAT help and offer wiring kits, electronic ignition, etc. They also have some really good explanation links.

They helped me determine that my "one wire" alternator that came on my B (that would charge but wouldn't drop below 7 amps at any time) had a problem and gave me instructions on how to fix it (and sold me the parts). Great folks to deal with.

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05-01-2002 16:48:57

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 Re: Re: Re: One wire alternator - not charging in reply to Bryan Smith, 05-01-2002 09:06:18  
one wire alternators are common on boat and large truck motors that run full throttle quite often. if it is truly a 1 wire unit, probably needs a very small pulley so it will spin much faster. try going to full thirottle and let it set for a minute, see if it "jumps in"

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