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 So in preparation for winter I've been checking and testing some things to avoid issues in the cold. It has been cool enough for the grids to cycle so I thought I would test a bit to avoid later issues.

 I checked for voltage at the grid heaters in the intake horn. I had 10.33v DC. That didn't sound right, why not 12+ volts so I checked at the battery- 12.5 volts (engine not running). Checked at the hot side of both relays-12.5 volts. Then checked grid side of relays-10.33 volts. 

 I'm going to assume this voltage drop at the relays is not normal or acceptable?

 Is this showing the contacts being worn and or cruddy inside the relay? Time to replace?


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If you had the grid heaters on and measured 12.3v on one side of the relay and 10.5 on the other side,  that is a 2v drop through that component.  So 17% of your energy is heating your contacts.   I think that is too much and indicative of the contacts beginning to fail.


Leave your grids on and feel the relays, are they too getting warm?   I never got to measure the voltage drop on mine, but eventually my originals got hot enough to distort (melt) the relay bodies.




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