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Messages - David Discenza

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1
Main Message Board / Re: Fuel Gauge Troubleshooting
« on: August 19, 2019, 04:16:44 PM »
Ron,
I'll look for it.  Thanks.

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Main Message Board / Fuel Gauge Troubleshooting
« on: August 19, 2019, 09:40:41 AM »
Hello! New member and first time Catalina owner.
We just took possession of a 1993 C34. During the seat trial, the fuel gauge was working. Now that I own the boat, it's not. I've done some preliminary troubleshooting with these results:
- I checked the voltage with mu multimeter at the instrument and it read 12.5 volts, same as the battery meter.
- I disconnected the sender wire and used a screwdriver blade to short across the sender input post and the ground post. The needled jumped to the 1/2 position on the gauge.
- I checked the resistance of the sending wire at the instrument. It read zero ohms at all settings of my multimeter
- I checked the resistance of the sending wire at the fuel tank. It read zero ohms at all settings of my multimeter

The needle of the gauge is all the way to the left, off the scale of the gauge. When I turn the ignition key, the needle jumps a millimeter or two and goes right back to all the way to the left, off the scale of the gauge.

I want to see if the repair shop at my marina has a fuel gauge that's known to be good. If they do, I'll temporarily connect it and see if it works. If it does, then it's definitely the gauge. If it doesn't could it be the sender as well as the gauge?  I'd appreciate the thoughts of others on this problem. Thanks to all who reply.

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