Ammeter glass fogging

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Model T Ford Forum: Forum 2013: Ammeter glass fogging
Top of pagePrevious messageNext messageBottom of page Link to this message  By Carl Klem on Friday, December 06, 2013 - 07:03 pm:

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!


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dan B on Friday, December 06, 2013 - 07:07 pm:

Hmmmm same here. I've always wondered the same but done nothing about it.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ted Dumas on Friday, December 06, 2013 - 07:13 pm:

Drill an 0.094 hole in the bottom of the case. A vented case will breathe and make it less likely to sweat.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Clayton Swanson on Saturday, December 07, 2013 - 09:22 am:

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.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Larry Smith on Saturday, December 07, 2013 - 11:26 am:

It's been so long since I've had an ammeter apart, I'm trying to remember if there is a gasket in there?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Charlie B actually in Toms River N.J. on Saturday, December 07, 2013 - 12:04 pm:

It got wet somehow. I agree with Clayton. It's getting warm enough to cause condensation.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Gregush Portland Oregon on Saturday, December 07, 2013 - 12:26 pm:

There is a gasket between the glass and case and maybe one between the glass and cover.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Hal Davis-SE Georgia on Saturday, December 07, 2013 - 12:36 pm:

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.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ted Dumas on Saturday, December 07, 2013 - 02:27 pm:

Things that are "almost" sealed tend to pump water with changes in humidity and temperature. A vented thing breathes and does not accumulate moisture.


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