Throttle Tilt/Trim - Need Help

[phatdaddy]

iid reverse the wires coming from the control tothe motor and see if the problem follows the wire, if so, probably a rocker switch fuzzed up.

[tsubaki]

Usual thing is the switch like phat said.
Use and age on the relay contacts are another culprit, ash deposits or weak relay spring.
Then start looking at the wire connections like jason was talking about.