642-Battery Not Charging

Help Support SkidSteer Forum:

bfingar

Active member
Joined
Feb 10, 2006
Messages
40
I pulled the 642 out of the garage the other day and the voltage gauge on the dash was reading low. I put a volt meter across the batt when running and it read about 12.5 volts. I know it should read around 13.8 when running and charging.
I have the service book for it, but I have not had a chance to look at it yet. I know the machine is a 12 volt machine and the ignition is 6 vdc. Is the voltage regulator in the alternator or is it hanging on the left side of the engine in the same vicinity as the ignition resistor? I am assuming it is in the alternator. It is probably time to have it rebuilt! Of course, it could be just a bad connection! Those are more fun to find!
Bernie
 

Tazza

Moderator
Staff member
Joined
Dec 7, 2004
Messages
16,844
Most alternators have the regulator built into the unit. It could well be a bad connection, you may want to try and runa w ire direct from the battery +ve to the back of the alternator just to be sure as it could be a blown diode that feeds power in too.
 
OP
OP
B

bfingar

Active member
Joined
Feb 10, 2006
Messages
40
Most alternators have the regulator built into the unit. It could well be a bad connection, you may want to try and runa w ire direct from the battery +ve to the back of the alternator just to be sure as it could be a blown diode that feeds power in too.
Last night I had a few minutes to check voltages at the connections to the alternator as per the service manuals instructions. Everything seems to be ok from a connection/voltage measurement point of view. Which of course means the alternator needs to be rebuilt. I still have a few weekends of work to do, so I guess I will just keep the battery charged and run it for a few weeks on the battery until I have some downtime to pull the alternator out and get it repaired.
 
Top