Digital trim issue....

[jerzia]

Optimax 250 Pro XS 2B360847
New to me Optimax with both Smartcraft Speedo and Tach. Trim reading is all over the place and doesn't repeat when in the same position. I recalibrated the gauge using full down, up, and trailering positions. If I trim up or down, the number bounces all over the place and changes with no trim movement. Is this typical of digital trim? Another issue that I'm having is with old eyes, the Smartcraft info is very hard to read. I thought of adding a SC100 trim gauge, but if it also acts that erratic, maybe it wouldn't be worth adding.

[trivialpursuits]

I'd suggest removing the sender from the port side of the motor, remove the central hub , check for corrosion or moisture inside. Clean it out and reassemble. Also be sure the mounting screws are good and snug when reassembling as shifting of the sender assembly can give erratic readings.

[SilverFox579]

Analog sender has 2 wires, digital has 3. Also check to see if trilobe pin is missing, if it is, trim won't read correctly.

[EuropeanAM]

Not really recommended that senders be disassembled, but they can be (by that point the sender is usually toast).

Check the three (3) wires from the digital sender and confirm they have CLEAN bullet connectors, that the connectors are fully inserted (male to female), and that the WIRE COLORS MATCH (yellow to yellow, blue to blue, Black to Black w/Orange Stripe).

THERE SHOULD BE NOTHING connected to the brown w/white stripe wire connector.

[jerzia]

Not really recommended that senders be disassembled, but they can be (by that point the sender is usually toast).

Check the three (3) wires from the digital sender and confirm they have CLEAN bullet connectors, that the connectors are fully inserted (male to female), and that the WIRE COLORS MATCH (yellow to yellow, blue to blue, Black to Black w/Orange Stripe).

THERE SHOULD BE NOTHING connected to the brown w/white stripe wire connector.

Everything is good that you suggested but still trim gauge is not right. I've done the re calibration procedure numerous times and yet it still doesn't repeat. The weird thing is, at times the bottom position reads 1.0 but the next 3.2 etc, etc. Then it will go back to 1.0. Sender bad?

[Savage]

Is the tri-lobe pin installed?

[jerzia]

Is the tri-lobe pin installed?

Yes it is.

[EuropeanAM]

Replace trim sender.

[jerzia]

I kind of thought that’s where it was headed. Does it have to be adjusted like the analog sender?

[EuropeanAM]

NO adjustment whatsoever.

The instrument should be calibrated to match the sender.

[jerzia]

Thanks much!

[Savage]

Is the starboard cross pin bushing still in place in the swivel bracket?

[jerzia]

Is the starboard cross pin bushing still in place in the swivel bracket?

Sorry, I just saw this, yes it is.

[jerzia]

Replaced the trim sender, problem solved!