I found a way to make my R&T to shift from low speed to high speed. This requires the addition of an off-on toggle switch installed on the dash or on the steering column. I installed a switch and have tested it for several days without any problem.
In wiggling the Molex plug, I was breaking/making contact with the pink wire on J1/1. This wire goes to the master relay and activates the coil on the relay. Switching the voltage on the pink wire off and on while pressing on the accelerator causes my cart to “shift” from low to high speed.
I did not replace the Molex plug. Instead I used some spray contact cleaner along with pinching together the female connectors on the plug to make better contact. This fixed my Molex plug issue.
Along with everything else, I replaced the key switch as it was intermittent. The EZGO switch mentioned up-thread works great. I ordered the switch on Ebay for less than $20. Be sure to buy a switch that has the terminals labeled (B, B1, L & I).
Another problem I found was the main fuse mounted on a piece of plastic on the right side. I found the nuts and washers on the bolts to be rusted which caused the fuse connections to be intermittent. This would make the cart to lose power at times.
I wired the toggle switch between the post on the master relay and the pink wire. I mounted the switch on top of the plastic cover on the steering column that covers the key switch and plugs. I ran the wires to the switch below the rubber floor mat and up the steering column.
To operate the toggle switch, begin moving forward at low speed with the switch in the “on” position. While moving, turn the switch “off” and let off the accelerator pedal. Then simultaneously press on the accelerator and turn the switch to the “on” position. This is tricky at first but when done correctly, the cart will “shift” to high speed. When you let off on the accelerator pedal, the cart will shift back to low speed.
I’m not sure why the switch causes the controller to go to high speed. I may have an issue with one or both relays. Or there may be a glitch in the controller. However, this simple fix is a way to get the cart to run at 25 mph.
This has been the most difficult golf cart to trouble shoot and fix that I have ever experienced. In saying this, this cart performs better than any cart I have ever driven. It’s impressive how fast these R&T carts will run!