Via email to Mayhem ... anything I overlooked?
I think the decaperm motor has a suppressor network fitted. Not certain though, so check.
Sets of polarised connectors on batteries and esc .
A 10 amp blade fuse and holder on each 12v battery +ve wire.
A 3 amp polyswitch between esc and motor. This "open circuits" on a stalled motor, before a main safety fuse ruptures. It cools and resets unlike a one-time fuse.
Optional one amp on/off switch wired into the esc red loop.
The esc won't turn the motor on battery connection or on loosing signal without one fitted however.
Enamel insulation varnish inside esc in case of condensation. Air dry the model internals after use.
I would just get new transmitter NIMH cells then do a range test and keep the 27 MHz set if there are no problems.
The esc filters out & warns of radio glitches but continues to work until total signal loss.