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666 alternator

B

Bradiniowa

Member
Problem has been going on for awhile. If the tractor sets two or three days the battery is completely drained or nearly so. Had two mechanics tell me how to check for a draw but both methods showed nothing. Tried disconnecting battery which stopped the draining, then left battery connected and disconnected alternator. This also stopped the draw. Question is, what is wrong with the alternator and is it repairable or need replaced?
 
Try disconnecting the large terminal first & see if there is a spark upon the disconnecting. If you have a small ammeter, put it between the disconnected wire & the large terminal on the Alt.
Read current draw--if any. If there is small draw here, rectifier is bad in alt.
If no trouble here, re-connect wire, & pull out 2-terminal connector on alt. & see if battery discharges. If no discharge on batt. now, regulator is probably at fault.
 
check under the dash at the terminal junction block and also inspect the cigar lighter closely. Rusty lighters can develop a short between + and - terminals internally. Rust and chaff at the junction block also cause a short to ground.

karl f
 
Can't get much closer to the arctic circle than Volga. We're down South of Wilton. If you were closer, I'd stop by to help.
 
if yours has a 10 si delco unplug the 2 wire plug check for voltage at the plug itself with ign switch off,one should have voltage all the time the other only when ign. is on, it's the exciter wire for the regulator, if voltage is present with the switch off it will keep the alternator switched on killing the battery grave yard dead, some tractors use an oil pressure switch to control it not sure which one yours uses
 
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