I have a 2004 5.0 Bravo III and I am having a few different issues, not sure if they are related or not.
When I boat the boat, both Tach gauges, MPH gauge and Volt gauge (port Side) did not work. I have had a marine mechanic look at them and he stated that there is power going to the gauges, he stated that I needed to replace or repair the gauges.
The boat is new to me this year and I have noticed that the port engine gets harder and harder to start. The ignition is a stander 3 position turn (off, on, start). What is does is when I try to start the engine, nothing happens. There is power as when I move the key into the on position (1 turn) it beeps and then when I turn the key to the start position I can here something in the engine, but the engine does not turn over. If I repeat this step, eventually like magic the engine starts.
When I first noticed the problem, I had to only turn the key back and fourth about 3-5 times, lately it may be upwards of 20-30 times. My original thought was battery, so I replaced that as it was old anyway, but that was not the issue. My next thought is the starter, but not sure it is thought.
A guy from West Marine seemed to think that maybe a need to replace the key ignitions or since some of the gauges are not working, but getting power, he was more inclined to think it was a grounding issue. Does not seem that a grounding issue would affect the gauges and the starting of the engine. Please let me know what your suggestions are.