Trim Gauge Wiring

[solent raider]

I thought it would be a good idea to fit a trim gauge. I purchased the appropriate gauge a Faria FAR13188. The engine is a Yamaha 70hp BET 6H3 (1983 I think)

Under my dash is a harness from the engine containing two seperate cables:

Cable 1= Yellow (ign), black(gnd), Green (tach send). These go to tach all works fine.

Cable 2= Black, pink, orange and grey. These colours corespond to those I can see leaving the trim sender on the engine bracket.

I connected the gnd from trim gauge to tach gnd and the black wire from the trim sender harness to gnd as well, the ignition to yellow on tach. I know this is correct as when ignition is on there is a voltage of 12.7 between the ign pole and ground pole on the gauge.

I then connected the orange wire from second cable beleiving it to be the send wire from info gained surfing the web. This did not work. Then I tried the pink wire as some sources on the web say this is correct. That did not work either.

The trim sender lever is not jammed or corroded and you can feel the spring working. But I cannot get it to work.

One interesting point is that when i put the voltmeter from the pink wire to gnd i got 12+ volts, with the orange wire only 7 volts.

Any ideas please.

[boats.net]

An aftermarket trim gauge wont work on that engine, then engine has a 3 wire trim sender and aftermarket gauge only work on 2 wire trim sender, would need to use a Yamaha 3 wire trim gauge on it.

[solent raider]

Thank you. I was beggining to go mad trying to work out why it would not work.