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Well, I was stranded for the first time ever by a motorcycle...and it was by my Honda no less. Now I have a peculiar electrical issue and want to see if anyone here has some thoughts (VFRWorld has been no help at this point).
The bike just died randomly while I was riding in 2nd gear. Couldn't restart or bump start while coasting (which was entertaining since I was on Hurricane Mt. road). Fuel pump doesn't prime and PCIII doesn't light-up when ignition & kill switch are on.
Battery good, Engine Cutoff Relay good, Fuel Pump relay good, TOS good, Kickstand switch good, Fuses are good (all relays function properly when pulled from bike and bench-tested). I have pulled PCIII out of the loop, no difference. Used another known-good battery: no difference (both batteries have 12.8v). No hacked wiring, PCIII is the only aftermarket electrical item.
Where I'm at now is this: One power line runs directly from battery to the Engine Stop Relay.
1. Key in Off position: voltage at relay on this line is = 12.8v
2. Key in On, cutoff switch in "kill" position: voltage drops to = ~6v
3. Key in On, cutoff switch in "run" position: voltage drops to = 2.75v
This voltage is supplied/connected to the FP Relay, which is why I'm assuming the FP doesn't start. When bike is switched on, FP relay gets 12v to turn on, but then passes the 2.75v to fuel pump (guessing FP needs 12v). I wouldn't think the voltage should drop like this, but haven't been able to confirm yet. I'm assuming other bikes would be similar...so does anyone know if the voltage should drop on this type of line?
At this point my only guess is that the ECU is fucked, since its tapped into the relay circuits and seems to be one of the few things untested. I can't test the ECU w/o a special test harness.
If you want to read the long story, check out my post on VFR World.
Anyone suggestions would be helpful at this point.