2011 precedent intermittent issue

[CoiloverCarts]

2011 Precedent 48v

**The only factory wiring I touched was the switched wire to the key switch to run to the battery gauge. At the switch it does still operate according to the volt meter**

Cart ran perfect then I added a light kit and a battery meter, now I have this issue.

-Sometimes no reverse buzzer with no solenoid click and no movement

-sometimes I get reverse buzzer with no solenoid click but no movement

-not often at all but twice in 3 hours yesterday I will get reverse buzzer with a very shuttered effort of a solenoid click and no tire movement

I did jump the MCOR, no luck. I did jump the obc and reset it, no luck. The key switch it reading pack voltage of 50.4v. Battery cables are clean and the cart ran perfect before I added the light and battery meter... I am at a loss.