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E‑Z‑GO Express S4: Triangle 3‑Pin Charging Guide
Intro
This guide is for E-Z-GO Express S4 (electric) owners. You’ll quickly identify the triangle 3-pin charging receptacle used on most electric S4 carts, choose a safe 48V smart charger, and avoid mix-ups with older D-plug/Crowfoot styles. We also include wiring/safety notes, lithium-conversion tips, and a simple troubleshooting checklist.
Quick Specs
- Model covered: Express S4 (electric)
- System voltage: 48V (verify your pack label or battery count)
- OEM port: Triangle 3-pin receptacle
- Typical charger output: 15–18A smart charger
- Chemistry: Lead-acid by default; LiFePO₄ with a lithium-profile charger
- Common upgrades: Triangle 3-pin receptacle refresh; Triangle ↔ Anderson/SB50 adapter for shop/fleet quick-connects
How to Identify Your Charging Port
- Geometry: Three pins in a triangle array inside a molded handle socket.
- Handle/latch: Many cords feature a latch-style handle—seat fully; don’t force.
- Location: Typically on the front cowl or side panel.
- Look-alikes to avoid:
- D-plug (PowerWise) used on 36V TXT (two large slots, “D” silhouette).
- Round 3-pin (Club Car) and 3-pin “clover” (Yamaha).
Recommended Chargers (Replacement & Upgrade)
Match plug type (triangle 3-pin) and voltage (48V). For lithium conversions, use a LiFePO₄ curve and follow BMS limits.
A) Standard Replacement (Lead-Acid)
- 48V / 15–18A smart charger with auto start/stop and temp/voltage protections.
CTA: 48V Triangle 3-Pin Smart Charger (15–18A)
B) Faster Turnaround / Fleet
- 48V / 18A reduces charge time; confirm healthy batteries and proper-gauge cables.
CTA: 48V 18A Triangle 3-Pin Charger
C) Lithium Conversions (LiFePO₄)
- Use a charger with a LiFePO₄ profile (no equalization). End voltage per pack/BMS (commonly 57–58.4V—follow your spec).
CTA: 48V LiFePO₄ Triangle 3-Pin Charger
D) Receptacle & Adapter Options
- Triangle 3-pin receptacle kit (housing, terminals, gasket).
- Optional Triangle 3-Pin ↔ Anderson/SB50 adapter for workshop quick-connects.
CTA: Triangle 3-Pin Receptacle Kit
Wiring & Safety Notes
- Polarity & pinout: Photograph the rear wiring; verify pin assignment before crimping/rewiring.
- Sense/lockout line: Poor contact here can mimic a dead charger—inspect and re-seat.
- Cable & fuse: Use the specified wire gauge and correct inline fuse; replace heat-darkened plugs.
- Ventilation: Charge on a dry, ventilated surface; don’t cover the charger.
- Lithium caution: Never run lead-acid equalization on LiFePO₄ packs.
Troubleshooting Checklist
- Charger won’t start
- Pack below start threshold → pre-charge to nominal first.
- Tow/Run switch not in Run.
- Corroded/loose triangle pins or damaged sense lead.
- Charging stops early
- High internal resistance/weak battery → load-test & balance.
- Thermal/voltage protection → improve ventilation; check pack health.
- Intermittent or hot connector
- Worn receptacle contacts → replace receptacle.
- Broken strain relief/frayed cable → replace cord/plug assembly.
FAQ
Q1: What plug does the Express S4 use?
A: Most electric S4 carts use the triangle 3-pin receptacle.
Q2: Is the Express S4 48V?
A: Electric S4 models are typically 48V. Confirm via pack label or battery count.
Q3: Can I use a D-plug or round/clover 3-pin charger?
A: No. Plug geometry and voltage must match. Use a 48V triangle 3-pin charger.
Q4: Can I fast-charge my S4?
A: 15–18A is typical for lead-acid. 18A is fine with healthy batteries/cables—monitor heat and follow manufacturer guidance.
Q5: I converted to lithium—what charger should I use?
A: A 48V LiFePO₄ charger with the correct curve and end voltage per your BMS. No lead-acid equalization.
Q6: Can I replace the triangle receptacle myself?
A: Yes—basic tools (crimper, meter, heat-shrink) are enough. Disconnect the pack, verify polarity, and follow torque/specs.
