12 V power plug shuts down then turns back on

by Chris

I have a 22 ft thundrcraft sometimes the gps and fishfinder shutdown then after a minute they turn back on! Maybe some kind of a resettable fuse? anyways I used my power 12Volt output plug (cigarette plug) to pump up a tube with a 12V air pump it shuts off but after a minute the power returns what could cause this?
the fish finder and gps and power plug are on the same circuit

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