allenf

I'm thinking the gauge itself is failing periodically. The gauge registers perfectly at the start of the trip and then stops working and trips the check gauges circuit. Have verified that the charging circuit is in good shape and charging! Before I tear apart the dash wanted to see if other had any similar experience?

Roler

Do a gauge cluster self check when this happens.
Then (when this happens) and you shut the engine off and restart, does it go back to normal?

Make sure all your connections are clean and tight. Especially the battery and alternator connections.

If you verified when the gauge goes 0 that your alt is charging normally, it might just be in the part between pcm and gauge.

lawsoncl

It's a 2000, so the PCM is telling the dash what to display right? Get an OBD reader and see what the PCM is reporting when this happens. Have you measured the voltage at the battery when this is happening?

DEN1956

hi,i had this happen to me it turned out to be the carbon brushes in the alt had worn down,a set of new carbon brushes cured the problem.hope this help you.

allenf

ok,.. I don't have one and this gives me the excuse to spend the money and get one,.. I found this on Amazon but do you have a better recommendation?

allenf

hmmmm,.. the alternator was replaced with a rebuilt ~40k miles ago,.. so I guess they could be worn out,.. I will check,.. thks!