When I power on my pinball pool, the "C" right inlane immediately lights and stays lit even when it is supposed to go out. None of the GI lights on the playfield work and the fuse blows upon startup. I looked at every socket with the bulb out and all seem good and I followed the wire around the bottom of the playfield and there does not appear to be anything wrong with the sockets on the other side. Any ideas what causes the C to light and what else to look for on the GI?

The fuse does not blow if the GI is not plugged in.

I had read on pinwiki that my problem is probably a short somewhere on the GI. Any advice on what to look for? I checked to make sure all lamps were not bent or touching metal as well as the inside of the socket. Could the wire that runs along the bottom of the playfield and to the lamps be a place to look?

Thanks, I am still trying to find the problem. How do I test the resistance between the two GI wires?

Ok so one lead on each wire that goes to each individual light? What about the other lead? Also, I changed the topic adding sound issue as well. The old tone board was smashed and did not work so I replaced it with a new one. The new board makes a beep that sounds correct but the other 2 tones are a click and a screech. I have swapped in other boards and I know my power supply works properly, cpu is good and after replacing a couple of transistors my driver board is good. Everything works except the playfield GI and the tones on the board. Also, high score displays garble as well as when I go into test mode. Everything else works. I checked the connector to the tone board and it looks as clean as can be. I also did all the ground upgrades in pinwiki and I zeroed out the old audits after replacing the battery. Any suggestions on my sound issue?

I swapped in a new driver board and same sound problem so I know its not that. Also, I jumpered ground to the chips on the tone board and it made correct tone sounds so I guess its somewhere in between but all the connectors are very clean without any corrosion.

This is how it is wired. Where should I put the leads and what ohms setting should I use? To be clear, the lights that do not work are playfield gi including pop bumpers and coin door lights. When I put a fuse in, the coin door lights do come on momentarily but the fuse blows.

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There is multiple G.I. strips. The back box lighting is on a different fuse

Zacaj, thanks for the help so far but I am a little confused. There are 5 different ohms settings on my dmm, 200, 2000, 20k, 200k and 2000k. Which one should I use? and Put one lead on the wire going to the lamp and what about the other wire? Also, with all the lamps out, it still blows the fuse. Will this affect my readings?

In the pinwiki guide, I saw it says the fuse for the gi lamps is usually a high amperage fast blow fuse. In front of the fuse holder is says 10 amp fuse but does not specify fast blow or slow blow. I am using a 10 amp slow blow fuse. I have never used a fast blow fuse in a pinball machine. Could this be why the fuse blows?

I have fixed the sound and gi lighting issues. First the sound, the original sound board did not work at all. I purchased a new sound board on ebay and it made one correct tone and the other 2 were a click and a screech. I wound up returning the board for another new one and it was the new board that was defective, the new new one worked perfectly. As for the GI lighting, I went through every light on the string again. Every light was registering around .4 ohms and one was registering 2.5 ohms. I closely inspected that socket and it was a little wiggly on the bottom. I desoldered the wire to it and I no longer blow a fuse. The advice zacaj gave me about testing ohms was the way I found the shorted lamp socket. Thanks to everybody who chimed in on my post. After working on my joker poker and pinball pool, I now know a lot about Gottlieb System 1.