g1 no spark

[jsimone]

i have no spark new coil not getting power to coil could it be bad cdi box or magneto any ways to test both

[golfcartg]

The ignition system on these carts relies on both a charge coil and a pulsar coil to generate the spark needed to ignite the fuel mixture. The charge coil produces a high voltage charge, while the pulsar coil sends a signal to the CDI unit to trigger the spark at the correct timing. When everything is working properly, these coils work in tandem to produce a strong, consistent spark that fires the engine's combustion chamber and keeps it running smoothly. If any part of this system is malfunctioning or out of spec, it can lead to a loss of spark and issues with engine performance.

The CDI control unit, while unable to be tested directly, can be diagnosed by either replacing it with a known good unit or thoroughly testing all its inputs. If other parts like the coils and wiring connections are functioning properly, and you're still not getting spark, the control unit could be the culprit, though failures are relatively uncommon.

Before we go diving into the CDI unit, lets check the ohms readings at the wire harness connections. Specifically, we want to focus on the connectors coming out of the engine that plug into the wire harness. These connections can sometimes go bad and cause issues with spark delivery. You'll want to check the ohms readings for the charge coil (brown and black wires) and the pulsar coil (white/red and white/green wires). The charge coil reading should be around 350 ohms, while the pulsar coil reading should be around 14 ohms. Taking readings from the engine harness side can help determine if the issue is internal to the engine or if it's a problem with the wire harness itself.

Select the ohms (Ω) setting on the multimeter dial, which is typically used for measuring resistance. Choose an appropriate ohms range based on the expected resistance value of the component you're testing. Then, insert the red test lead into the port labeled "VΩmA" or "Ω," and insert the black test lead into the common (COM) port. Zero out the multimeter by touching the two test leads together to account for any resistance in the leads. Once zeroed, you're ready to perform your resistance test by touching the test leads to the points you want to measure. The multimeter will display the resistance value on the screen, allowing you to accurately measure resistance. If you have any questions just ask!