Quote:
Originally Posted by reminckv
Thanks for your reply. I'm no expert on these devices, but I'm not sure why you are saying that they are all 15V coils. I'm not saying that you are wrong and I understand that they will handle 15V across the coil for a period of time, but I've looked at the Trombetta, White Rodgers, and Emerson catalogs and only one I saw was rated at 15V. In fact, White Rodgers offers the same relay with both 12V and 15V options. It's pretty clear from all of the failures that RVers experience that the lower cost 12V relays have a shorter life expectancy than what I consider acceptable (at least under certain operating conditions).
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Because any coil designed to operate in a 12 VDC system subject to charging voltage has to be rated to 15 VDC since alternator charging voltages routinely run to 14.5 VDC and sometimes higher. Any coil rated for a maximum of 12 VDC will quickly fail in a system where minimum battery voltage is above 12 VDC.
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