EFP sled with MMX conversion experiencing repeated breaker trips when battery is connected

Gear

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2006Sled forum

20 years old. Gear and prices may have changed since.

A breaker that repeatedly pops when a battery is connected but stays engaged without a battery typically indicates a short circuit in the electrical system
To isolate a short circuit, disconnect all cables and test the sled; then reconnect them one at a time to identify which cable causes the breaker to trip
If the breaker trips even with all cables removed, the short circuit exists within the base unit itself and requires opening the housing to inspect for worn wire insulation or exposed metal contacts
The breaker should never be bypassed as it provides essential protection against shorts that could cause wire melting and create additional electrical damage
A temporary workaround while awaiting repair is to replace a faulty breaker with an inline fuse of appropriate amperage rating
Common failure points in dual voltage sleds include loose connections on the rear of voltage selector switches, worn centerpost cables, and multipin connections in the upper and lower junction boxes

The MMX conversion details and its specific wiring configuration are not fully described in the thread
The exact cause of the short circuit in the original poster's sled was never confirmed or reported back in the thread
The discussion assumes familiarity with the internal structure of EFP sleds and their wiring
The recommended replacement breaker model is specific to one brand and may not apply to all EFP variants