Make sure the coin switches are in the "rest" position. Look at a drawing of them in the game manual or search on the internet: Clay's guides, Pinwiki, etc. Williams uses a funky set up compared to Bally. Gottlieb is kinda simple without using microswitches.

If the Coin relay doesn't activate when you press the Credit Button, diagnose this circuit with Alligator clip jumper wires.

Pinball (resized).png

In your picture, you have no credits. Open the back box and roll the credit wheel. It could be just that simple.

You need to tidy up that wiring re solder them and heatshrink they look like there is bare wires that could be shorting?
If the games lights up but doesn't complete the reset cycle
Check the fuse under the playfield next to the big reset bank coil. This is a 110volt coil careful! turn off at the power point before you touch this .
good luck