Do these values sound right to you?

[tlfinn]

My cart is just barely dragging along...so I went in with my DVM and these are the numbers im getting:

Switch off F/R in F tested B- and M- no pedal 37.7V
Switch on F/R in F tested B- and M- pedal pressed 38.7V

Should I be getting that voltage with the switch off and no pedal???

and would a faulty switch cause my cart to barely move (like 4-5mph)?

also this is on a battery pack of 38.7V

[HarryT]

You don't say anything about cart model, year or model. It sounds like the speed sensor on the motor is bad.
Harry

[tlfinn]

2001 Ezgo TXT

[bronsonj]

So it's an 01 txt. Is it a sepex or series? I thought all the series versions stopped before then but I'm not sure.

When you are in the cart and accelerate what is the pack V? I know sitting there with no load it's 38.7 but wondering if there's an issue when under load.

Also the pre-charge resistor on the solenoid will let some voltage across even with the key off and pedal up. I don't know if that's the cause of your 37.7V reading or not though.

[JohnnieB]

If there is a resistor connected between the solenoid's two large terminals, then there will be a voltage between B- and M- with the pedal up as long as the battery pack is connected.

The 1V less than full battery pack voltage reading you're getting is fairly typical for having a 250Ω pre-charge resistor installed on the solenoid.

The low speed issue can be caused by several things depending on the drive type. Does your cart have a series drive or is it a PDS (sepex drive)?

[JohnnieB]

Originally Posted by bronsonj

So it's an 01 txt. Is it a sepex or series? I thought all the series versions stopped before then but I'm not sure.

.............

Series drive in regular EZGO golf cart were produced through 2009, or at least all of them were Sepex or AC starting with model year 2010.

Not sure when the specialty and industrial carts stopped have series drives.