Hello all. I’ve been reading on the forum for a long time, but this is my first post. I’ve read about every thread there is regarding Lightning Coil and R/R testing.
2000 Mercury 90 HP 4stroke
S/N 0G999693
From what I understand this is just a Yamaha with Merc Lower unit?
If the Voltage test fails when the output wire is hooked up (loaded), but all other test appear to pass, could the R/R still be bad? Or do you suspect a wiring issue? Sorry but I don’t have a manual for this engine.
Here’s what I came up with during testing
Voltage at Battery resting: 12.8
Engine Idle @ battery - 12.7
1500 RPM @ battery - 12.8
Engine running battery disconnected, 6-9v at battery leads
From 3 yellow wires @ R/R input
Readings at idle:
1-2 18v ac
2-3 18v ac
3-1 18v ac
1500 RPM:
1-2 34v ac
2-3 34v ac
3-1 34v ac
Red wire from regulator at idle
Disconnected 17v
Red wire from regulator 1500rpm
Fluctuates 10-15v
Starter + lug with battery connected
At idle 12.7
1500i RPM 12.7
Red wire at R/R back probed 1500 RPM 12.8
Thanks for all your help!
Keith
2000 Mercury 90 HP 4stroke
S/N 0G999693
From what I understand this is just a Yamaha with Merc Lower unit?
If the Voltage test fails when the output wire is hooked up (loaded), but all other test appear to pass, could the R/R still be bad? Or do you suspect a wiring issue? Sorry but I don’t have a manual for this engine.
Here’s what I came up with during testing
Voltage at Battery resting: 12.8
Engine Idle @ battery - 12.7
1500 RPM @ battery - 12.8
Engine running battery disconnected, 6-9v at battery leads
From 3 yellow wires @ R/R input
Readings at idle:
1-2 18v ac
2-3 18v ac
3-1 18v ac
1500 RPM:
1-2 34v ac
2-3 34v ac
3-1 34v ac
Red wire from regulator at idle
Disconnected 17v
Red wire from regulator 1500rpm
Fluctuates 10-15v
Starter + lug with battery connected
At idle 12.7
1500i RPM 12.7
Red wire at R/R back probed 1500 RPM 12.8
Thanks for all your help!
Keith
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