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Fred
Disconnecting the micro switches at the engines does not prove that the wiring in the engine bays are ok, could be a intermittant short in there when the engine is running, remember this wiring is 30 years old and has put up with a lot in the bays.
The squat switch operates the HYD control valve to stop retraction on the ground, unlike the the old 337 where a solenoid goes across to stop you from lifting the U/C lever.
On your 337G if you put the U/C switch to up on the ground the horn would sound to warn you have done this.
The best way to check all the switches would be to go to pin 4 white wire on the dual voltage unit with a DVM and operate both the squat and the throttle switches. You could even megger the wires thru WITH THEM DISCONNECTED AT BOTH ENDS to see if you have a wire that is rubbed thru somewhere.
Regards
Pete
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