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My C80 in my 05 348 screen flickers while on the hook on DC. I installed a 2nd house battery last weekend so it's not a low voltage issue. Once I start the engines the flickering goes away. I suspect I may have a bad ground, I can live with the flicker but I am concerned that if I have a bad ground could it be causing me other problems while on the hook. Just last week I changed the AC/DC converter on the fridge can this all be related or am I thinking to deep.
Also my 05 has no dash screws and I would like to pull the dash apart as one of the instruments is turned ( it drives me crazy ) does anyone know how to pull the switches and dash apart. Without me breaking anything that is.
Thanks in advance.

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Terry
2005 Vista 348
5.7 Volvo I/O

I have an aftermarket chartplotter so I can't give you exact instructions. One my boat the bezel pulls off the chartplotter and then that exposes screws. I remove the screws and the chartplotter pulls out. Then you can reach in and fix your other guage.

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2008 V358 Two-tone Blue V/P Dual Prop 320 HP
Lake Winnipesaukee, NH

Yep. you pull out the chartplotter and that lets you get to the back of the dash. From there you can get to the back of the turned gauge and fix it. Most gauges are held in place with a U-shaped bracket, typically with a single nut. The bracket pulls the gauge against the dash. You remove the chartplotter by first popping off the bezel (best done with a tack puller tool, which looks like a slightly bent screwdriver that has a fork in it). Once the bezel is off you remove the four screws around the perimeter of the plotter. It'll then pull right out of the dash. There should be just enough slack in the wires to allow you to set the plotter out of the way, rested on the steering wheel. Otherwise just disconnect the wires. Each plug is uniquely shaped so you don't have to worry too much about what goes where.

As to the flickering. check the voltage at the plotter when it's flickering. And compare that against the voltage at the battery. If there's more than a 1v difference then you might need to replace the power line going to the plotter. Could be the same sort of trouble you had with the fridge.

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-Bill Kearney, 2005 348 Vista