Lithium golf cart problems after a conversion, and how to fix them

These are the problems owners report most often after switching to lithium — in golf cart forums and in low-star reviews of conversion kits — grouped by symptom, with the usual causes in the order to check them. They're general pointers: your kit's manual and the brand's support come first, and anything involving the controller or high-current wiring is a job for a golf cart technician if you're not sure.

The cart won't move after the swap

E-Z-GO TXT/RXV: the charger interlock (the small wire from the charge receptacle) was left disconnected when the lead-acid charger came out, so the cart thinks it's plugged in. Reconnect it as the kit manual shows; Fleet Lithium and Lithium Rhino both route it to battery positive.
Run/tow switch still on TOW (Club Car, E-Z-GO), or the key switch or forward/reverse switch not fully engaged.
The battery is asleep or in protection mode: many packs ship in sleep mode or switch off after a fault. Wake it with the pack's button, app or charger as the brand describes.
Main cables swapped or a loose lug: re-check against the photo you took before the swap.
Solenoid coil not matched to the voltage, if the voltage changed (36V to 48V).

It cuts out on hills or when accelerating hard

The pack's continuous current (BMS rating) is below what the controller draws. A pack rated 100A on a cart whose controller pulls 250–350A will trip under load. Our cart pages flag this combination.
Lifted carts, bigger tires, six passengers and steep driveways all raise the current. The fix is a pack with a higher continuous rating (200A+), not a bigger charger.
On E-Z-GO RXVs an overcurrent trip can also lock the electromagnetic brake until the cart is reset.

The gauge drops from 50% to zero all at once

The gauge reads voltage. Lithium voltage stays almost flat from full to nearly empty, then falls off a cliff, so a voltage gauge (including the cart's old one) shows "plenty left" until it doesn't.
Fix: use the kit's state-of-charge meter or app, or add a shunt-based monitor that counts amp-hours. Calibrate it with a full charge.
If a properly calibrated meter still shows far less capacity than advertised (one owner forum report describes a "100Ah" pack that delivered about 70Ah), document it and contact the brand under warranty.

The charger won't charge, blinks or faults

Lead-acid charger still in use: it needs the lithium charger (43.8V for 36V, 58.4V for 48V).
Older Club Car with an onboard computer (OBC): it can block the new charger until it is bypassed as the kit explains.
Pack fully discharged and asleep: some chargers won't start on a pack that reads near zero. Wake the pack first (brand instructions).
Below freezing: packs with low-temperature protection refuse to charge until they warm up — that's normal.
Yamaha Drive/Drive2: the charge port's third pin is part of the charging logic; use the plug made for your year range.

Lights, horn or radio stopped working

They used to tap 12V from two lead-acid batteries. With one lithium pack you need a 48V- or 36V-to-12V converter — often not in the box.
If a converter is installed: check its fuse, and that its input range covers a full charge (about 58.4V on 48V).

Range is much shorter than advertised

"Up to 50 miles" figures assume a light two-seater on flat ground at low speed. Four or six people, hills, lifts and big tires can cut that sharply.
Estimate your own range with our range calculator and size the pack for your longest trip.
Rule out a gauge problem (see "drops to zero") before blaming the pack.

Faults when going downhill (G19, AC carts)

Carts with regenerative braking (Yamaha G19, AC Drive2 and other AC carts) push current back into the pack. A BMS that can't accept it, or a pack that is already full, can fault.
Choose a pack whose brand mentions regen support, and avoid starting a long descent on a 100% charge.

Avoid most of these before you buy

Most of these problems trace back to choosing a pack that doesn't match the cart: wrong size, too little current, missing converter, wrong plug. Each cart page lists the kits that fit, warns when a pack's current is too low for the stock controller, and explains that cart's charging quirks. The conversion guide walks through the install in the order that avoids them.

Sources: owner threads on Cartaholics: an E-Z-GO TXT that ran again once the charge-port wire was reconnected, the interlock wire on a TXT Fleet, a "100Ah" pack measured at about 70Ah; installation notes from Fleet Lithium (E-Z-GO TXT) and Lithium Rhino (E-Z-GO RXV). Checked October 27, 2026.