After about 15 minutes of driving my '24 roadster, the glass on my ammeter gets a quarter sized fog cloud on the inside of the glass.
It goes away after sitting for awhile. Looks like condensation, but the car is always kept in the garage, not out in the rain, and dusted not washed. Any thoughts or ideas. Oh, it works fine too!
Hmmmm same here. I've always wondered the same but done nothing about it.
Drill an 0.094 hole in the bottom of the case. A vented case will breathe and make it less likely to sweat.
feel to see if it is warm also. many times the contact between the post and the gauge itself (inside the case) gets bad. bad connection=heat. i like to solder them.
It's been so long since I've had an ammeter apart, I'm trying to remember if there is a gasket in there?
It got wet somehow. I agree with Clayton. It's getting warm enough to cause condensation.
There is a gasket between the glass and case and maybe one between the glass and cover.
I don't understand how getting warm will cause condensation. It is usually caused by moist air coming in contact with a cool surface. Do you suppose the moisture is in the windings somehow and comes out when the winding warms up, then condenses on the cool glass? Kinda odd.
Things that are "almost" sealed tend to pump water with changes in humidity and temperature. A vented thing breathes and does not accumulate moisture.