Have Boat Questions? Ask a Boat Repair Expert.
Hello Joseph Tan here.
Do you notice if the gauges shut off? Can you get a jumper wire and connect one end directly to 12 volts and the other end directly to the positive side of the ignition coil and run the boat?
Disconnect the gray wire at the tach or the ignition coil. If the tach shorts it grounds the ignition killing spark. It could be a faulty tach.
Who knows it might take it that long to fail or the engine to loose voltage. Temperature can cause electrical components to fail.
Corrosion will create heat and the loss of continuity and voltage loss.
Thank you.....Keep me posted.