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Re: Alternator won't let diesel engine shut off
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Posted by Jon H on April 25, 2005 at 22:36:40 from (69.26.17.34):
In Reply to: Re: Alternator won't let diesel engine shut off posted by Bob on April 25, 2005 at 21:20:02:
A few years ago when the $400 90 amp,self energizing alternator burned up on my Steiger tractor,I replaced it with a 1 wire 72 amp Delco. This was cheap,but did not work very well. I did not like having to rev the cold diesel engine to excite the 1 wire regulator,and the 72 amp alt was a little undersize and ran hot. The engine has an unused accessory pulley,so I decided to add another Delco alternator. I put 63 amp stators in both alternators to make the cooling chore easier,and used a standard regulator in one alternator,so atleast one would excite at a cold start,slow idle. The easiest source for switched 12V power to excite the standard regulator was the Cummins fuel solenoid power terminal. I installed a diode in the wire from the fuel solenoid to the Delco#1 excite terminal to prevent alternator back feed from keeping the fuel solenoid energized.
It worked well,two fans to cool 126 amps keeps the alternators cool in dirty air,and will run a full accessory load at idle. The rebuild cost of the Delco alternators is a fraction of the cost of the original high dollar alternator,and running two alternators gives me the option of continuing to use the tractor at reduced electrical load if one alternator fails. This happened last harvest when one alternator had a front bearing fail. I removed the drive belt from the bad alternator,and worked the tractor all day. Worked fine as long as I did not have to Work late enough to need lights.
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