GE FX503 Controller
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Product Information
Specifications:
- Model: GE FX503 G19/22
- Compatibility: Works with various cart models
- Required Tool: Analog or digital volt ohm meter (VOM)
Product Usage Instructions
Steps to Perform Before Control Installation:
- CHECK MOTOR WINDINGS:
- Set VOM to RESISTANCE ().
- Measure A1 to A2: Must measure BETWEEN 0.3 and 1.
- Measure F1 to F2: Must measure BETWEEN 1 and 2.
- Measure A1 to F1: Must measure OPEN.
- Measure F1 to motor case: Must measure greater than 5M.
- CHECK MAIN SOLENOID:
- Disconnect all wires from the main solenoid.
- Set VOM to RESISTANCE ().
- Measure solenoid coil: Must measure NO LESS than 100.
- Connect VOM leads to the main solenoid lugs.
- Attach jumpers from main battery positive and negative to the
coil (small terminals). - Meter must jump from infinity to LESS THAN 0.3.
- MOVING SOLENOID COIL PIN: Move wire in
position 11 of the 23-pin harness to pin 17. Refer to detailed
steps on Sheet 4.
Frequently Asked Questions (FAQ)
Q: What should I do if any of the specified ranges are not met
during checks?
A: If any of the items checked do not fall
within the specified ranges, the controller will fail. These issues
must be corrected before installing the controller, or the warranty
will be void.
Q: Is it recommended to replace the solenoid along with the
controller?
A: Yes, it is recommended to replace the
solenoid at the time of controller replacement. FSIP now stocks
popular replacement White Rodgers solenoids for your
convenience.
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GE FX503 G19/22
This sheet is provided to aid in the installation of your GE FX503 controller. Upon installation, you may encounter problems that may, or may not, be due to a faulty controller. The following steps must be taken to help diagnose a possible cart fault or faulty controller. An analog or digital volt ohm meter (VOM) will be needed to perform these checks.
WARRANTY WILL BE VOID
If These Steps are Not Performed Before Installing The Control
STEPS TO PERFORM BEFORE CONTROL INSTALLATION
CHECK MOTOR WINDINGS:
Set your VOM to RESISTANCE (). With your motor disconnected, measure A1 to A2. This must measure BETWEEN .3 and 1. With your motor disconnected, measure F1 to F2. This must measure BETWEEN 1 and 2. With your motor disconnected, measure A1 to F1. This must measure OPEN. With your motor disconnected, measure F1 to motor case. This must measure greater than 5M.
CHECK MAIN SOLENOID:
Disconnect all wires from the main solenoid. Set your VOM to RESISTANCE (). Measure the solenoid coil. This must measure NO LESS than 100. Connect VOM leads to the main solenoid lugs. Attach jumpers from main battery positive and negative to the coil (small terminals). Meter must jump from infinity to LESS THAN .3.
MOVING SOLENOID COIL PIN: This FX503 controller uses a different pin for the solenoid coil connection to the controller than the original Yamaha controller. You will need to move the wire in position 11 of the 23-pin harness, to pin 17. For detailed steps, please see Sheet 4.
IF ANY OF THE ABOVE ITEMS ARE NOT WITHIN THE SPECIFICED RANGES THE CONTROLLER WILL FAIL. THESE ITEMS MUST BE CORRECTED BEFORE THE CONTROLLER IS INSTALLED OR WARRANTY WILL BE VOID.
It is recommended to replace your solenoid at the time of controller replacement. FSIP now stocks popular replacement White Rodgers solenoids for your convenience.
Sheet 1 of 4
51-FX503G022 Install Sheet-370 Rev 0 7/8/2025
Sheet 2 of 4
51-FX503G022 Install Sheet-370 Rev 0 7/8/2025
FX503 G19/22 Troubleshooting Sequence
FOR SAFETY, ALWAYS LIFT THE DRIVE WHEELS OFF THE GROUND WHEN TROUBLESHOOTING!
ALL TESTS ARE CONDUCTED WITH RUN-TOW/MAINTENANCE SWITCH IN THE RUN. ALSO, THE CONNECTOR MUST BE ATTACHED TO THE CONTROLLER WHEN MAKING THESE CHECKS. YOU WILL NEED TO `BACK PROBE’ THE PINS FROM THE WIRE SIDE OF THE CONNECTOR. USE A PAPERCLIP IF NECESSARY.
Attach voltmeter negative (-) lead to main battery for the following tests
Use the following sequence when checking individual pins (don’t skip steps). If you find a fault, do not move on to the next step until the fault is corrected:
Measure the voltage at the main battery positive post (let’s call it Pack Voltage) Pin 1 & 2 With Run/Tow Switch On, must equal Pack Voltage
– If not Pack Voltage, check wiring and Run/Tow Switch for an open condition. Pin 4 With F/R Switch in Forward, must equal Pack Voltage
– If not Pack Voltage, check wiring and F/R Switch for an open condition. Pin 5 With F/R Switch in Reverse, must equal Pack Voltage
– If not Pack Voltage, check wiring and F/R Switch for an open condition. Pin 10 With Direction Switch in Reverse, must equal approximately 0V (and Reverse Alarm sounds)
– If not approximately 0V, check wiring and Reverse Alarm for shorted/open condition. If Reverse Alarm tests good, controller may be defective.
Pin 6 With Key Switch On, must equal Pack Voltage – If not Pack Voltage, check wiring and Key Switch for an open condition.
Pin 6 With Pedal Down, must equal Pack Voltage – If not Pack Voltage, check wiring and Pedal Switch for an open condition.
Pin 17 With Pedal Down (Contactor energized), must equal approximately 0V – If not approximately 0V and solenoid does not engage, check solenoid for open/short condition. If solenoid tests good, controller may be defective.
Pin 9 Must equal approximately 4V – If not approximately 4V, check wiring and Throttle Pot. If wiring and the Throttle Pot test good, controller may be defective.
Pin 8 Must equal 0V – If not 0V, check wiring and Throttle Pot. If wiring and the Throttle Pot test good, controller may be defective.
Pin 7 With Pedal Up, should read approximately 0.5V – If not approximately 0.5V, check wiring and Throttle Pot for shorted condition.
Pin 7 With Pedal Fully Down, must equal approximately 3.5V – If not approximately 3.5V, check wiring and Throttle Pot for open condition.
Pin 15 Must equal approximately 12V – If not approximately 12V, remove speed sensor to see if voltage recovers. If it does return replace speed sensor; if it does not return, check wiring.
Pin 16 Must equal approximately 0V – If not approximately 0V, check wiring and Speed Sensor. If wiring and the Speed sensor test good, controller may be defective.
Pin 14 While slowly turning the drive wheel, must toggle between 0V and approximately 4.5V – If not toggling, check wiring and if necessary, replace Speed Sensor and magnet.
Sheet 3 of 4
51-FX503G022 Install Sheet-370 Rev 0 7/8/2025
INSTRUCTIONS FOR MOVING PIN 11 TO PIN 17 ON THE 23 PIN CONNECTOR
FSIP Electronics also offers the following Technical Support options …
Troubleshooting Manuals / Codes www.shop.fsip.biz/en/content/technicaldocuments
Live Tech Support Chat www.shop.fsip.biz
Technical Support Forum fsip.websitetoolbox.com
PRE-INSTALLATION INSTRUCTIONS MUST BE
FOLLOWED OR WARRANTY WILL BE VOID
IMPORTANT! GE FX503 G22 TROUBLESHOOTING INFORMATION INCLUDED IN THIS PACKET
Sheet 4 of 4
51-FX503G022 Install Sheet-370 Rev 0 7/8/2025
Documents / Resources
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FSIP Electronics GE FX503 Controller [pdf] Installation Guide 51-FX503G022, 51-FX302G022, GE FX503 Controller, GE FX503, Controller |