The outlet is a convenience outlet for plugging in a soldering iron or light. It is not fused, so you can cook until your house breaker trips.

Verify you have credits on the machine. Drop a few quarters to see if you get any credits. What is shown on the player one display after power up? Anything show up on the balls in play and credit section? If you can, open the head and lets see some good pics of the circuit boards. (Not too important yet)

Report back. It sounds like it has reverted to factory settings. We can walk you through that.

Download the manual from IPDB.org

Figure out how to work the settings - number of coins for a game(s), etc. figure out to set the score level for a free game. If original boards, set the first free game level to the lowest possible setting. Doing so, everyone should be able to achieve a free game, thus you don’t need to drop quarters.

Good to hear it’s going. Happy holidays and stay safe.