Hi all new to forum and this is my first post so any help much appreciated.
I have recently acquired a used Crown 20MT90A to replace a 15MS64A that didn't quiet have the lift height i needed.
As i plan to use it in a home garage work storage enviroment.

The 20 had been sitting out in the weather for past 18 months so it has it's share of surface rust dirt and bird poo lol

Below is a list of what i have done to fault find.
Surprisingly internal wiring and connection are fairly clean no signs of any major corrosion.
Check oil
Replace battery's with ones from my 15
Bypass key as i don't have one with it
Check door switch and manual lift leaver switch
Connected external 12v to pump motor terminal and that works fine

The problem
I am getting a reading of 6v on multi meter from - batt terminal to key terminal that I bridged, but no power to any functions not even the horn I cant hear any clicking of solenoids only the micro switches when handle controls are moved or pressed although up raise does not click.
Bridging large wires either side pump solinoid works pump.
When looking over things the far left contactor i think it's called has a crack in the mount not sure if its contributing to any of the issues

I would like to test the drive motor but am unsure of what wire is what could someone advise what the 4 wires are please and where to connect 12v jumpers to if possible.

Also any help in where i should start looking to track faults would be much appreciated.

I'm happy to swap parts from 15 if needed to eliminate faults just not sure where to start.
Sorry for a long winded first post.

Thanks again
Richard