Mcor issue?

[smille5291]

2001 DS 48v regen when the cart is up on a jack wheels off the ground the output voltage of the mcor matches the input 4.67volts at WOT then when I put it on the ground the output drops to 3.4 volts at WOT ? I'm on my 3rd mcor they all ohm good the other 2 mcors (older Version) would work intermittent at 4.67volts the cart goes 19-22mph then would cut down to 2.5volts 5-6 mph and 3.4volts 11-14mph all while the input stays at 4.67volts the newer version mcor also cuts down to 3.5 volts 11-14mph while on the ground. Im charging the batteries now to see if that helps it was going to 43.3-47 volts while on the ground and staying at 48.3 volts off the ground. any input is appreciated. Im thinking it might be a wire connector issue I'm going to look into it deeper but just wondering if anybody has experienced this before. ? thank you

[R&TBabich]

Originally Posted by smille5291

.... Im charging the batteries now to see if that helps it was going to 43.3-47 volts while on the ground and staying at 48.3 volts off the ground. any input is appreciated. ....

With wheels off the ground there is barely any load on the motor/batteries.
Wheels on the ground now has a load on the system so a drop in voltage when under load is normal.
Those voltages seem low in general.

[Fairtax4me]

48.3v Pack voltage is almost dead.

Where are you buying these MCORs? If they're aftermarket, Made in China, that's probably part of the problem.

[smille5291]

1 was original or at least what was on it the second one I bought online yes prob Chinese because who the hell wants to pay $150 for that POS. so it didn't do the job so I paid the piper got the updated version same exact results. both ohm out perfect. but the voltage is not right. maybe if the third wire is a ground maybe that might be the problem. ?