Have Boat Questions? Ask a Boat Repair Expert.
I'm sorry I do not understand you. What you are looking for is Voltage.
This is a 12V system so you would set the meter to just 20V.
Do you have good access from the helm where the keyswitch is back to the engine room where the battery is?
I understand, no power on the red wire at the key switch, got it.
What I'm asking is if you have good access. Do you have good enough access to simply run a new wire?
Before I go any further, I do assume you have all of the grounds connected to the battery, is that correct?
The problem is the boat is 37 year old, with 37 year old wiring. A few could have blown. Or you could have a rotten wire at the battery. The question is going to be where is it? Where is the blown fuse, or the rotten wiring? On a 37 year old boat it could be anywhere. In my experience you can spend hours looking for it, and might never find it. Or you can spend an hour or two, or more or less, and simply run a new wire right to the battery, stick an inline fuse on it right there, and it is gauranteed to work. And if the fuse ever blows in the future at least you know where it is. Does that make sense?
Again it would come down to a blown fuse or rotten wire. If you look at your starter solenoid. Originally there are 2 large gauge wires with fuses inline on them. Have you located these fuses yet, and checked them?
Are you still with me?