Trim Gauge Not Working

[timheis]

My trim gauge doesn't move (on an Merc Alpha1 outdrive). It is always at 1/4 deflection (shortstop position) with key on or key off.
I measured 12v to ground at the gauge with the key on.
When I connect the sender side to ground, I get no movement (this is how I checked my fuel gauge, I do not know if the trim gauge is the same).
Is this a good test for the gauge?
Do trim gauges always default to 1/4 scale?

Tim

 

[rickdb1boat]

Re: Trim Gauge Not Working

From teleflex site:

The Trim Gauge can be tested by: Power the gauge by connecting a positive wire to the "I" terminal and
a ground wire to the "G" terminal. Have no other wires connected to the gauge. Pointer will read full UP
(all but Johnson/Evinrude outboards and pre-1978 OMC Selectrim - they will read full DOWN).
Next, with the power still connected, short the sender terminal at the gauge to ground. Pointer should go
to the full DOWN position (all but the Johnson/Evinrude outboards and pre-1978 OMC Selectrim - they
will go to full up).​

 

[timheis]

Re: Trim Gauge Not Working

Thanks Rick

I must have a bad gauge then.