DerekWillmott
1 µW
- Joined
- Jan 25, 2022
- Messages
- 3
Hi. Can anyone help me sort this out?
I have a brand new GMAC ready to roll kit from Grin installed.
After grounding the battery negative to the frame, everything tested perfectly, including the very bright headlight (from Grin, prewired for the CA output plug). I wanted to tidy up the wiring, and the headlight had a foot of extra wire to it, so I cut it and installed a new jack much closer to the headlight. The polarity matches the original. There is no short circuit. Resistance across the centre pin and ground barrel is open with one polarity, 2 megohms with the other polarity. I also shortened wires from the brake cutoffs and the throttle, but that was before everything tested good. I did not touch the multifunction switch wire.
Now, brakes, throttle work perfectly if the light is unplugged. But, if the light is plugged into the CA when power is turned on, the CA does nothing. If I then unplug the light, the CA backlight comes on, but no information. If I then cycle the battery power, the CA comes back to life and seems to behave normally.
However, the on/off switch of the multifunction switch does not work anymore, whether or not the light is plugged in. The other buttons on that switch work normally.
At no point was the light cord attached to the CA while working on the cord. I don't see how I could have shorted out the dc power output, unless the short is inside the light. But as I said, the light worked before, and I have not tampered with it internally.
There is still battery voltage at the dc output plug from the CA, so I haven't blown an internal fuse on that wire.
Is the MFS on/off ceasing to work consistent with a short on the dc power output?
Any thoughts?
I have a brand new GMAC ready to roll kit from Grin installed.
After grounding the battery negative to the frame, everything tested perfectly, including the very bright headlight (from Grin, prewired for the CA output plug). I wanted to tidy up the wiring, and the headlight had a foot of extra wire to it, so I cut it and installed a new jack much closer to the headlight. The polarity matches the original. There is no short circuit. Resistance across the centre pin and ground barrel is open with one polarity, 2 megohms with the other polarity. I also shortened wires from the brake cutoffs and the throttle, but that was before everything tested good. I did not touch the multifunction switch wire.
Now, brakes, throttle work perfectly if the light is unplugged. But, if the light is plugged into the CA when power is turned on, the CA does nothing. If I then unplug the light, the CA backlight comes on, but no information. If I then cycle the battery power, the CA comes back to life and seems to behave normally.
However, the on/off switch of the multifunction switch does not work anymore, whether or not the light is plugged in. The other buttons on that switch work normally.
At no point was the light cord attached to the CA while working on the cord. I don't see how I could have shorted out the dc power output, unless the short is inside the light. But as I said, the light worked before, and I have not tampered with it internally.
There is still battery voltage at the dc output plug from the CA, so I haven't blown an internal fuse on that wire.
Is the MFS on/off ceasing to work consistent with a short on the dc power output?
Any thoughts?