Temperature Gauge not working, Yamaha T50 4 Stroke

karlibob

Recruit
Joined
Aug 26, 2013
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4
I recently purchased a Harris pontoon boat with a 2001 Yamaha 50 HP 4 stroke. The boat has a temperature gauge that lights up when the Nav switch is switched on. When I turn the key the needle moves from a rest position to the bottom of the scale but nothing happens after that. Can anyone tell me what to look for at the engine and under the dash?
 
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