issue with fuel gauge...

[bebeard]

Good Day All,

I hope you can help me. I have a 1977 Challenger Bass Boat with a Merc 1500 150 HP, and a Mercontrol Throttle Box.

My Ignition switch when out, and I replaced it with a new identical one, and performed a wire to wire swap out and soldered each connection.

Well, now I am having a problem, and I don't know where it has originated, but there is a primary accessories power to the batter that runs my gauges, lights, & trolling motor, but when I have the key out of the ignition switch, the fuel gauge shows "Fuel", but when I put the key in the ON or START position the gauge drops to "Empty". I cannot figure this out... can anyone help?

Please let me know if you have any other questions...

Thanks in advance,

P.S. Please feel free to email me directly if neccessary:

Brook

[bebeard]

Ok...

it has finally been nice enough to get out and do some testing... but here is what I have found so far...

I disconnected all my hots from the battery and then just connected the accessories power supply, and all works fine. Even with the key in the ignition and in the ON or START Positions, the gauges work fine. The issue that I have found now, is that when I connect the "primary" power supply and then put the key in and in the ON or Start Position the fuel gauge drops to "Empty"..

Hope this helps, and thanks for the help!

Brook