slow club car

[elcombs]

The cart does the dame thing in reverse that it does going forward at 3/4 throttle. Under load the voltage goes from 50.15 volts to 47.7 volts and when it reaches the 3/4 position the voltage goes back to the 50 volt range. When I removed the battery caps, I noticed a black film on top of the acid almost like a paste. I have never seen this before. I am charging the batteries now and will check the specific gravity this afternoon.
Thanks,
Bubba

[erict]

Originally Posted by elcombs

The cart does the dame thing in reverse that it does going forward at 3/4 throttle. Under load the voltage goes from 50.15 volts to 47.7 volts and when it reaches the 3/4 position the voltage goes back to the 50 volt range. When I removed the battery caps, I noticed a black film on top of the acid almost like a paste. I have never seen this before. I am charging the batteries now and will check the specific gravity this afternoon.
Thanks,
Bubba

Your battery pack is dropping down to 30% of their output. That's a 70% drop. Looks like a battery issue to me.

[elcombs]

I have a cheap hydrometer but all of the balls floated when I tested the cells. The voltage abviously drops when take off and maintains approximately 48 volts and when it reaches the 3/4 throttle and drops out the voltage goes back to 50 volts. Could it possibly be the MCOR unit out of adjustment?