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Author Topic:   T&T Sending Unit
sport15er posted 07-25-2001 09:04 PM ET (US)   Profile for sport15er   Send Email to sport15er  
My T&T gauge on my '87 Evinrude has ceased functioning. Can the sending unit be tested off of the motor, or will I have to put the boat in the shop? The tilt motor works fine, it's just the gauge. I know alot of folks that think the gauge for t&t is a waste for outboards... Well, it is more or less a luxury, I tend to always look at the motor anyway. However, I'd like to keep up with the orig setup. I haven't contacted my marina yet, anyone know what the sending units go for roughly?
Hank posted 07-26-2001 12:18 AM ET (US)     Profile for Hank  Send Email to Hank     
The sending unit is mounted on the engine with a couple of screws. You could remove it(with some difficulty) and have it tested. However why not check it yourself?
My '84 Evinrude had a problem which I traced to a corroded connection of the sending unit in the junction box on the engine.
Your problem may not even be with the sending unit. The connections at the gauge can get corroded and may just need a little
cleaning. I mention this because of personal experiencee.

An ohm meter to do some continuity checks would be helpful. Lacking this, just trace the sending unit to its connectors and clean them up. Mine were so badly corroded I just made permanent splices.


where2 posted 07-26-2001 08:13 AM ET (US)     Profile for where2  Send Email to where2     
Good advice, the thing I would add is that with an ohm meter, you should be able to check the sending unit with it still mounted to the engine, initially. On my '85 70Hp Johnson, it can be operated by hand with the engine tilted all the way up. All the way up should result in a very different amount of resistance through the sender than all the way down. Every stage between up and down should show a different resistance through the sending unit.
Remove the mounting screws from the gauge, and test it there. If it is an open circuit (infinite resistance in any position), move back to the junction box and check the circuits to the gauge for continuity. If continuity exists to the gauge, check resistance through the sending unit. If none, replace sending unit.
White Bear posted 07-26-2001 10:27 AM ET (US)     Profile for White Bear  Send Email to White Bear     
Make sure the ground wire which attaches under one of the two screws holding the sending unit to the motor is intact. Removing the two screws themselves (especially if they have been in place since new) can be a real chore - I wound up grasping the fillister heads with vise grips and backing them out about 1/16 turn at a time.
Hank posted 07-26-2001 09:44 PM ET (US)     Profile for Hank  Send Email to Hank     
Just a second thought. Make sure ignition keyswitch is off when doing continuity testing on the sending unit or gauge.

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