Just to the left of the brake res. cap is a connector screwed to the wall seperating the engine compartment , 3 wire.
Back probe the V/WT wire and hook a 12v test lamp there .
If this lamp lights when you try the start, the problem is down at the starter.
I suspect that as you heard possible sol click..
A rap on the starter sometimes works, [ temporarily , just to verify ]
It can also be a bad starter ground.. simply jumper cable from bat neg to engine metal..
If no light , it is from there back..