I picked up a working Gottlieb Mushroom World pinball recently and everything was working on it when I got it. Things worked fine for a bit when I was playing it at home and then I noticed the bottom pop bumper didn't appear to be doing anything. I checked the fuse and noticed that it was blown. I then checked around the pop bumper for any visible issues and found nothing... I replaced the fuse, it fired off and then blew the fuse again. So that's problem number one. I replaced the coil on it and I'm still getting an oddly low ohms reading... The other two pop bumpers get around 15-18 ohms, while the new one gets 2. The coil is the same part number as the other two and it's brand new. So I'm assuming short somewhere? How do I track it down?
Second problem: The right flipper died. The contact at the button still works as I can press the right button to cycle diagnostics... But other than that, it's not firing the coil. I checked the fuse and it's fine.
The thing is, both of these parts were replacements on the game and most everything else is original. So that leads me to believe it was a bad install job but I still really can't pinpoint where the problems are. I have since ordered new original Gottlieb flipper kits and I'm planning to install those tomorrow.
But generally I'm just wondering how exactly I can diagnose and track down the source of these fuses blowing. I've googled various guides and stuff but it's all very general and not specific to exactly the problem I'm having. Any help would be greatly appreciated. Thanks!