How do I tell if my golf cart is Series or Sepex?

Check the Forward/Reverse switch. If it is a large mechanical lever by your knee, it is likely a Series cart. If it is a small rocker button on the dash, it is a Sepex (Shunt) cart. Also, check the motor terminals: Series motors have 4 large terminals, while Sepex motors have 2 large and 2 small terminals.

Which golf cart motor is better for hills?

For extreme, steep hills or towing heavy loads, a Series motor is superior because it produces higher low-end torque. However, a modern Sepex motor with an upgraded 500A controller can handle most neighborhood hills while offering better top speed and control.

Can I convert a Series cart to Sepex?

It is possible but very expensive and difficult. You would need to replace the entire wire harness, the motor, the controller, the F/R switch, and the solenoid. It is usually cheaper to sell your Series cart and buy a Sepex model (like a Club Car Precedent or EZGO PDS).

Research // Motor_Tests

Series vs. Sepex Motors: Hills vs. Speed Guide

Which motor is better: Series or Sepex? We compare the torque, speed, and hill-climbing ability of both DC motor types to help you choose the right setup for your terrain.

In the Research Lab, we have dyno-tested both. Series motors are the old-school “Tractors” with massive torque, while Sepex motors are the modern “Sports Cars”—efficient, programmable, and fast.

01 // The Identification Lab

Before debating performance, identify your cart by checking these hardware markers.

1. The “Series” Cart (Beast of Burden)

F/R Switch: Mechanical lever by your right knee. Physically yank it for direction.
Tow/Run: Missing. Series carts do not have this switch.
Motor Terminals: 4 Large Posts (A1, A2, S1, S2). All wires are thick 4 or 6-gauge.

2. The “Sepex” Cart (Smart Cart)

F/R Switch: Electrical rocker button on the dashboard.
Tow/Run: Present under the seat. Must flip before servicing.
Motor Terminals: 2 Large (A1, A2) and 2 Small (F1, F2) for the “Field” coil.
Speed Sensor: Features a magnet sensor on the end cap.

02 // Performance Showdown

Round 1: Hill Climbing (Torque)

Winner: Series Motor

The Series motor is wired so the Armature and Field coils receive the same high current. When you stomp the pedal at 0 MPH, it can dump 400+ Amps into the windings instantly.

Real World: Pull a deer out of a ditch or climb a 30% grade with 4 passengers. It won’t be fast, but it will never stall.

Round 2: Top Speed

Winner: Sepex (Shunt) Motor

Sepex motors use “Field Weakening.” The controller lowers current to the Field coil while keeping the Armature high, tricking the motor into higher RPM without more voltage.

Real World: Easily hits 19-22 MPH with a simple code change. Series carts usually top out at 14-16 MPH without re-gearing.

Round 3: Drivability (Control)

Winner: Sepex (Shunt) Motor

Regenerative Braking: Slows the cart safely on downhills and recharges the battery.
Runaway Risk: Series carts free-wheel on hills, accelerating dangerously until you hit the brakes.

03 // The Upgrade Path

Upgrade Component	Series Cost	Sepex Cost
Motor	$600 (High Torque)	$0 (Stock is fine)
Controller	$500	$30 – $500
Required Extras	$230 (HD F/R & Solenoid)	$0
TOTAL EST.	~$1,350+	~$500

04 // Summary Checklist

The Hunter / Farmer: You need a Series cart. Hauling heavy loads through mud requires torque king.
The Neighborhood Cruiser: You need a Sepex cart. 20-25 MPH speed and safety braking are priority.
Off-Roaders: If you have a Sepex cart for off-roading, upgrade the controller to 500A to compensate for big tire torque loss.

Lab Verdict: Match to Terrain

Series carts are mechanical workhorses for heavy labor. Sepex carts are digital performers for speed and pavement. Choose based on your primary use case to avoid expensive conversion mistakes.

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