OK,clean ball count unit(switches) checked both soleniods (cleaned)  was sticky in steper so cleaned adjusted a tight screw ,now steps up and resets down. Turn on pin and goes. Flippers work and scores ,went though scoring by hand and advancing bonus ,when it toped bonus at 5000 it makes a buzzing noise  ,coming from credit wheell (steper) ..So I turned pin off..Restarted and did same buzzing noise.I then moved the credit wheel position (I think it was on 0 )  to 2 .To see if the buzzing would stop and turned game on, lights looked dim as half powered  and then game stopped ...Shit... Only back glass lights on now...game will not start now, just the back lights on...Have set credit wheel on 0 credits with all 3 switches on the credit wheel are set closed..
Tryed puting paper in 3rd switch from the back glass but still will not start..
The previous owner said it worked,who knows?
It has had the chimes taken out and 2 meters put in their place, the wiring to that looks simple 2 wires conected to the free game knocker and one to the bottom board (pin going to coin door)  so that looks halmless ,so I have removed it(cut the 3 wires) this has not changed any other wiring loops.
I think I might "have a go" at returning to original, the pin conectors  at bottom board to coin door,They have been modified with I think a diode and a high power resistor.
I have a SPIN OUT GTB I can copy off,I think I can get it back to standard and the coin door wiring.Then after this have a go at getting it going again.
WHAT DO YOU THINK OF THAT AS A PLAN?