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trim gauge

Depends what is already on the motor. Does it have a trim sender down on the swivel bracket with a pigtail coming off it, or is there nothing there and the trim position only shows on a SmartCraft gauge?

If the sender is there you do not need a converter. It is just a variable resistor. Reference and ground to two of the wires, the signal wire to the sender terminal on the gauge. What gets people is the sweep. An aftermarket gauge that wants a different ohm range will read fine in the middle and lie at both ends, so you get a needle that says half trim when you are all the way down. Put a meter on the sender and sweep it full down to full up before you buy anything. That number tells you whether your gauge will ever agree with it.

If there is no sender and trim only lives on the CAN bus then a converter is the wrong road. That data does not come out as a resistance. You are into a gateway or a gauge that reads the digital side, not an analog needle.

So which gauge are you trying to drive, Mercury OEM or something aftermarket? And is there a part number on the sender if you have one? Those two answers put you in one camp or the other.

I have only done this on older motors where the sender was already sitting there, so treat the digital side as a guess on my part...

Thanks
 
Thank you for the reply. This motor has a magnetic piece on the pump shaft. The sender works on Volts not ohms. The trim gauge works on 0 to 190 ohms. The converter goes in series in the trim wiring harness. My problem is the wire colors on the converter don't match the motor harness.
 
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