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Re: Re: Re: Re: Alternator
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Posted by Jon Hagen on February 22, 2001 at 23:33:16 from (63.160.195.62):
In Reply to: Re: Re: Re: Alternator posted by Al English on February 22, 2001 at 17:39:06:
I use quite a few of the one wire alternators as they are simple to wire. I buy just the regulators and use them to convert junkyard 3 wire alternators. The last box of regulators I got had a slip of paper inside saying that if kick in rpm was too high the # 1 regulator terminal can be connected to switched 12V to excite the alt at low rpm. It said nothing about hooking the #2 wire to the bat terminal for voltage sensing like a std regulator needs. Also it seems that the stator size has a lot to do with the kick in rpm on a one wire Delco 10SI The little 37 amp stator will start charging at 1000-1500 rpm while the big 61 or 72 amp will sometimes take 3000. Never have had a problem getting replacement regulator plugs at auto parts stores,just tell them it is for 74-85 GM. If the one wire alternator has been unused for a while you may meed to flash the rotor by momentarily connecting both regulator terminals to the bat terminal while the alternator is turning fast. If an exciter wire is used on a gas engine tractor you need a diode or generator light in the exciter wire if you must hook it to the ign side of the switch, to prevent backfeed into the ign coil. What I like better is to wire the exciter wire through a two terminal oil pressure switch to the battery so the exciter wire connect/disconnect is automatic, this eliminates the backfeed problem on a gas engine and prevents battery run down on a diesel if you forget to turn off the manual switch.
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