Mighty Mule FM500 blew up green circuit board by reversing battery

[PeterD]

YOu want it below where any landscaping/gardening/maintenance is likely to hit it. That's the 16 inches.

[RosemontCrest]

Again, pull a new length of string when adding new wires. Always keep a length of string in the conduit.

[RosemontCrest]

Exactly. It's not just the concern of frost damage. I would bury it at least 24".

[HP maint. Tech]

replying to Joseph Donner, HP maint. Tech wrote: yes.. there is a diode that protect the board. Use your DVM on diode mode check it the diode string ( polarity sensitive if you haven't checked Diodes before). These are all surface mount componets so a small soldering iron is all that is needed. Too large of a soldering iron you could lift the trace. I have a Blue Board and did the same thing connecting my gate to the battery in the dark and replaced the one diode that open up. Cheap fix few cents vs $250 for new board.

[Joseph Donner]

Oh, thank you so much for your reply.  I've been waiting 9 years for an answer.