1979 Johnson V4 115 HP - Viking Deck

[pkimball]

I recently purchased an old Viking sport deck with a 115 hp outboard. Almost none of the instruments work and it run on an external fuel tank. Any idea on where to start? I want to reattach the tachometer. Do I wire the positive right into the ignition switch? I see the grey wire hanging out of the cable for the tach signal.

Thanks

 

[alldodge]

Welcome
Which 115hp motor do you have?

Most all electrical gauges work the same way. They require power coming from the key switch to turn them ON (Purple wire). Also require a ground (Black wire). There can also be a wire to light the gauge up at night.

Last is a sensor wire and will vary in color depending on which gauge it's for. In the case of the gray Tach wire it goes back to the motor

 

[pkimball]

Welcome
Which 115hp motor do you have?

Most all electrical gauges work the same way. They require power coming from the key switch to turn them ON (Purple wire). Also require a ground (Black wire). There can also be a wire to light the gauge up at night.

Last is a sensor wire and will vary in color depending on which gauge it's for. In the case of the gray Tach wire it goes back to the motor

Thank you, I tried wiring the Tach and voltmeter to the accessory and the ground. Everything seemed to work, but then when I tried to start the engine, the fuse blew. I am wondering if this is from my wiring or that the fuse is likely old since the motor is nearly 50 years old. I have the 115ML79R.

 

[alldodge]

Don't think it would be the fuse unless the fuse is to small amperage and that's real doubtful. Most likely it's wiring, the gauge or sensor. The wires were cut prior so I would say it's the gauge

 

[pkimball]

Don't think it would be the fuse unless the fuse is to small amperage and that's real doubtful. Most likely it's wiring, the gauge or sensor. The wires were cut prior so I would say it's the gauge

I found a blown fuse in the wiring harness, so I am going to go grab some today. Maybe it is just the age of the fuse and trying to start the boat for the first time since last summer.

 

[alldodge]

Fuse should not be more than 20 amp