I have a 1998 1900 SR. It has two accessory switches on the dash. I’m in the process of installing a fish finder so I’m investigating these two switches to possibly use to power it.
One rocker switch doesn’t have any wires connected to it. The other switch is a momentary rocker switch and has a green and blue wire connected to it. This switch doesn’t seem to do anything when depressed, at least when out of the water with the battery connected. I haven’t tried the switch in the water yet with engine running to see what it does.
A line (power) should be run from a spare fuse holder on the positive bus bar to the inbound side of the switch. A line is then run from the outbound side of the switch to the device. The ground on the device is tied into the ground bus bar.
I believe that most fishfinders have a permanent power source wire that keeps all info. Wiring into a rocker switch would cutoff power source. If that's what you prefer, have at it.
So I decided to connect the fish finder directly up to a spare output on the fuse block. I’m using the spare accessory switch to route the radio power through. Previous owner told me they would disconnect the wire harness when done boating to prevent draining the battery.
I just noticed as I was looking everything over for my fish finder install that the 2nd accessory switch was connected to something and it peaked my curiosity as I don’t know what it is connected to. Can’t think of to many things that you would want to connect up to a momentary switch on a boat?
Mine came with its GPS connected to an accessory switch. I mean its ok but kind of redundant because I turn my batteries off at the switch when its docked.
Accessory switch question
Linear Mode
