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First of all, the battery should be fully charged. 11.9 is not. However, I don't think that's the crux of the problem.
The solenoid doesn't sound like it's energizing. A half-charged battery shouldn't have any problem energizing the solenoid. You should hear it click. However, getting the starter motor to rotate the engine is another matter.
"The voltage drop test is not real reliable - the problem is how much current can flow"
Current flow is a function of voltage and normal current flow during cranking lowers the available voltage. If the battery voltage drops only .2 volt, the starter motor isn't seeing any voltage and current flow is nil.
The following assumes the starter motor assembly was successfully bench-tested.
I suggest jacking up the RR and remove the tire. Check the connections on the solenoid and make sure they're on. I forget the correct color code but you can check with a voltmeter which wire is for the "crank" signal from the ignition switch (source voltage only available during cranking). You might discover:
a) the wire connector was not connected
b) the source wire or connector from the switch to energize the solenoid is faulty
c) the ignition switch is not connecting source voltage from battery to the solenoid wire
d) you may have switched the small wires on the solenoid.
Hope this helps,
Sherwood
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