Temp Gauge Pegging--help trouble shooting please

[Gulfster]

Thanks Wakejunky.  I agree--it has to be the MDC.  Now I just need to sell the new temp gauge and sender I bought.  Anyone want these? 

[lilfoo2225]

didnt you say all specs were good and you switched gauges and all worked but the temp gauge? wouldnt that mean the gauge is bad? confused...

[Gulfster]

Me too.  But I installed a brand new gauge and it did not fix the problem.  I also installed a new sender, and again, it did not fix the problem. The wiring checks out fine.  I switched 5-pin plugs from working gauges and it did not fix the problem.  I switched 5-pin plugs between the volt gauge and temp gauge and the volt gauge worked fine and the temp gauge did not.  So it must be internal to the MDC.  There is nothing else.

Gulfster. 

[lilfoo2225]

i still think its the gauge.

[Rambling Wreck]

Perhaps I should stay out of this conversation since you guys are way past me but sometimes Murphy's Law applies. What if either the new sender or guage is bad???

[Gulfster]

RW, then, as Murphy would say, I'm F-*&^%*'d. 

llllfoo225, guess we'll have to see when I get the new MDC.  At that point, I will have installed a new sender, new gauge and new MDC.  if this does not work, guess I'll just have to install a new boat under the sender, gauge and MDC

Thanks again all. 

[lilfoo2225]

Perhaps I should stay out of this conversation since you guys are way past me but sometimes Murphy's Law applies. What if either the new sender or guage is bad???

yeah i was thinking gauge cause in troubleshooting it explains his problem to a T and would be his gauge is bad since all the specs are good. strange but not the first time ive heard of a new part bad right out of the box. i dont trust the mdc or the gauges as far as i can throw them lol. cheap design. need a touch screen like the new "tiges"

[Gulfster]

   Drum roll please......And the winning answer is:  Bad MDC.  I finally got the new MDC installed and got the boat back in the water.  The temp gauge works perfectly now.  I'm convinced that whomever hooked a ground wire to the MDC temp gauge input fried the internal circuit.  But now its fixed.

Thanks for everyone's help. I hope this thread helps others.

Best, Gulfster.

[lilfoo2225]

awesome! good work and happy boating now!

[Avidx22]

Hi!

I have a fuel gauge that does the same thing as your temp gauge. Actually, the gauge works for a few minutes but slowly creeps past full and then ends up pegged all the way to the right and stays there until the engine cools down. The boat is a 99 and this is the first time it has happened.

I don't have testing equipment so I was hoping to get some feed back from somebody's trial and error experiences.

Let me know

Tx!

AvidX22