RV , A/C units use 12 volt controls to run the 120 volt side through relays , any chance that your batteries are low from time to time and it's some sort of low battery warning ?
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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