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Need help wiring 1997 Yam 90 to tilt/trim gauge

T

Tanta

New member
My 1997 Yamaha 90CTLV outboard tilt/trim sender has a 3 wires, the trim gauge is a Sierra Marine Eclipse Series 2'' Trim Indicator Replacement Gauge - Trim, Yamaha, O/B, pre-2001. Can someone assist in matching the wires to the gauge? thx.
 
Jim Marshall said:
Black wire with ring terminal to ground. Blue wire to Up on gauge green wire to down.
Click to expand...


Thanks for the reply, it I am still confused. The three wires coming from the sender are black, orange and pink. The terminals on the gauge are marked G, I and S. So not much is matching.
 
Methinks the trim and tilt pump motor wiring is getting confused with the trim sender wiring.

The three wire Yamaha sender requires a 5 volt power supply. Normally it comes from a Yamaha tachometer. The orange wire provides the 5 volts. Black is ground. Pink is the sender signal.

Is the trim gauge you have designed for a Yamaha three wire sender? Seems so. What are the wire colours or markings on the post terminals?
 
boscoe said:
Methinks the trim and tilt pump motor wiring is getting confused with the trim sender wiring.

The three wire Yamaha sender requires a 5 volt power supply. Normally it comes from a Yamaha tachometer. The orange wire provides the 5 volts. Black is ground. Pink is the sender signal.

Is the trim gauge you have designed for a Yamaha three wire sender? Seems so. What are the wire colours or markings on the post terminals?
Click to expand...

The posts are marked G, I, S. Thx
 
Hmmmm. Got me wondering.

The Yamaha three wire sender is a potentiometer. It is designed to have a set voltage applied to it. The output voltage is interpreted by a Yamaha gauge to determine the engine trim angle.

I am wondering if the Sierra gauge for a pre 2001 Yamaha is designed to work solely on the resistance of the potentiometer. That would be my best guess. If so, connect the ground wire from the sender to the ground terminal (G) on the gauge. Connect the pink wire from the sender to the sender terminal (S) on the gauge. The I terminal will be connected to a key on power source. Normally the yellow wire from a key switch. The G terminal on the gauge will also need to be connected to the battery ground. The black wire from a Yamaha key switch.

See if the gauge works correctly. If the gauge now works but is backwards, let us know.
 
boscoe said:
Hmmmm. Got me wondering.

The Yamaha three wire sender is a potentiometer. It is designed to have a set voltage applied to it. The output voltage is interpreted by a Yamaha gauge to determine the engine trim angle.

I am wondering if the Sierra gauge for a pre 2001 Yamaha is designed to work solely on the resistance of the potentiometer. That would be my best guess. If so, connect the ground wire from the sender to the ground terminal (G) on the gauge. Connect the pink wire from the sender to the sender terminal (S) on the gauge. The I terminal will be connected to a key on power source. Normally the yellow wire from a key switch. The G terminal on the gauge will also need to be connected to the battery ground. The black wire from a Yamaha key switch.

See if the gauge works correctly. If the gauge now works but is backwards, let us know.
Click to expand...

That worked, gauge is now registering correctly. thanks for the help .. Tanta
 
On a similar note, same setup but my gauge only works on the lower portion of trim (3 or 4 inches of travel) and not the full trim.
 
Dvdfst3 said:
On a similar note, same setup but my gauge only works on the lower portion of trim (3 or 4 inches of travel) and not the full trim.
Click to expand...
Has this problem always been there or is it new?

Is the trim sender cam in good working order? They were originally plastic. Which would break. Has been replaced by a metal cam.

If the cam is working correctly, has the cam been set such that when the motor is in the full down position then the trim gauge should be indicating the full down position.

Assumption being that the Faria gauge is designed for use with a Yamaha three wire sender.
 
boscoe said:
Has this problem always been there or is it new?

Is the trim sender cam in good working order? They were originally plastic. Which would break. Has been replaced by a metal cam.

If the cam is working correctly, has the cam been set such that when the motor is in the full down position then the trim gauge should be indicating the full down position.

Assumption being that the Faria gauge is designed for use with a Yamaha three wire sender.
Click to expand...
The cam appears to be OK. I pulled the sender and the gauge will not start to register until the sender is rotated about 3/4 of the way and full rotation shows full down.

My additional question is how are there 3 wires off of the sender and only 1 sender post on the gauge. Has something been changed out?
 
Dvdfst3 said:
The cam appears to be OK. I pulled the sender and the gauge will not start to register until the sender is rotated about 3/4 of the way and full rotation shows full down.

My additional question is how are there 3 wires off of the sender and only 1 sender post on the gauge. Has something been changed out?
Click to expand...
My guess is that someone tried to use the wrong Faria trim gauge. The resistance of the sender (empty to full) is not compatible with the resistance that the Faria gauge is looking for.

 
Another thought is to change the trim sender from the three wire type to the two wire type.

But at Yam's prices it might be cheaper (and easier) to change the gauge.
 
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