It cuts out over bumps but is fine on smooth ground

That points strongly at a loose or corroded connection somewhere in the power path, most likely a battery terminal or a main cable lug. The bump momentarily breaks a contact that is only just holding. Clean and tighten every connection to bright, solid metal before looking further.

It dies on long hills then works again

That is often a controller protecting itself from heat by cutting power, especially on a warm day or after repeated climbs. If drive returns once things cool and the demand eases, protective cut-back is the likely cause rather than a failed part. A genuinely weak battery set does something similar, so check charge and battery health too.

Is it safe to keep using while I work out the cause

If it is cutting drive suddenly while moving, no. Losing power without warning at speed or on a slope is a safety risk, so take it out of use and have the power path diagnosed. A gentle, predictable loss of power is less urgent, but it still wants fixing before it becomes a full failure.

Buggy cuts out while driving

By James Brown · Updated 21 July 2026 · 6 minute read

White electric golf buggy plugged into a wall-mounted charger unit in a workshop

A buggy that cuts out while driving is usually losing its power path momentarily: a loose or corroded battery connection, a solenoid that is not holding, or a controller cutting back when it gets hot. A safety switch that is intermittent does the same. Check the connections first, because that is both the most common cause and the easiest to fix.

Key takeaways

Cutting out is an interruption in the power path, most often at a battery connection.
A loose or corroded terminal can carry current until a bump breaks it, which feels random.
A hot controller cutting back can feel like the buggy dying on a long or repeated climb.
A solenoid that drops out under load, or an intermittent seat or pedal switch, gives the same symptom.
If it cuts out at speed and leaves you without drive suddenly, treat it as a fault to stop and diagnose, not to keep using.

Why it feels random

The frustrating thing about cutting out is that it rarely repeats on demand. It happens over a bump, on a slope, after twenty minutes, and then behaves for an hour. That pattern is itself a clue. Faults that come and go are almost always a connection or a switch, because a solid electrical fault stays put, while a loose one only shows when movement or heat or load disturbs it.

So the honest approach is not to chase the moment it cuts out, but to find the weak connection that a bump can break.

Connections first

With the buggy off, look at every battery terminal. You are looking for anything loose, anything green or white with corrosion, and anything that has been arcing, which leaves a darkened or pitted look. A terminal that carries current normally but breaks contact over a bump is exactly what produces an intermittent cut-out. Cleaning to bright metal and tightening to the correct torque fixes a large share of these calls.

Follow the heavy cables too. A cable that is corroded inside its lug, or a main connection at the solenoid or controller that has worked loose, does the same job as a loose terminal. This is unglamorous checking, and it is where the fault usually lives.

Heat, the solenoid and the switches

If the connections are sound, think about heat and load. Controllers protect themselves by cutting power when they run too hot, so a buggy that fades or drops out on a long climb, on a warm day, or after repeated hard use, and then recovers once it cools, is likely showing protective cut-back rather than a broken part. That is the controller doing its job.

Two mechanical culprits remain. A solenoid, the main contactor that connects the pack to the controller, can develop contacts that no longer hold reliably under load, dropping the drive for an instant. And the safety switches, the seat switch and the pedal micro-switch, can become intermittent, cutting power when they lose contact. Both give the same cutting-out feel and both are diagnosable with the right test gear.

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When to stop rather than persist

There is a difference between a buggy that gently loses power and one that cuts drive suddenly at speed. The first is a diagnosis job you can take your time over. The second is a safety matter, because losing drive without warning while moving can put you or a passenger at risk, particularly on a slope or near people. If it does that, take it out of use and have the power path checked properly rather than hoping the next drive is fine. An intermittent fault that is ignored tends to become a total one at the least convenient moment.

Common questions

It cuts out over bumps but is fine on smooth ground: That points strongly at a loose or corroded connection somewhere in the power path, most likely a battery terminal or a main cable lug. The bump momentarily breaks a contact that is only just holding. Clean and tighten every connection to bright, solid metal before looking further.
It dies on long hills then works again: That is often a controller protecting itself from heat by cutting power, especially on a warm day or after repeated climbs. If drive returns once things cool and the demand eases, protective cut-back is the likely cause rather than a failed part. A genuinely weak battery set does something similar, so check charge and battery health too.
Is it safe to keep using while I work out the cause: If it is cutting drive suddenly while moving, no. Losing power without warning at speed or on a slope is a safety risk, so take it out of use and have the power path diagnosed. A gentle, predictable loss of power is less urgent, but it still wants fixing before it becomes a full failure.