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Bigdog

Noise from electrical box

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All of a sudden after being plugged in with land line I moved and came back to same location two hours latter and plugged in again

and now ever few seconds I get a ping then a pong sound from the back of the breaker box were the land line is connected?

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What happens to the lights when it pings.

Sorts sounds like an auto reset CB, that maybe part of the 12 v charge system.

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Haven't used lights but TV goes off and on plugged into inverter

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12 volt lights dim and brighten in unison with noise. how do I correct?

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Again an auto reset CB.  MAYBE its between the battery and charger. Your voltage is going between 13.5v, cb on and 12.5 v cb tripped. Again MAYBE a bad cb or there is a shorted wire some where. Time to get the ol' eyeball working.

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Your coach battery connected properly? Sounds like the cables are reversed.

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what is a CB 

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