Troubleshooting Output Short Message on Hayes G2 Brake Brake Boss Controller part # HA81792BB


Was driving on the highway and suddenly alarm sounded and said output short. What are the possible causes? I now have disconnected the trailer and it still says output short. Does this Indicate a problem with the truck? Does it need to be reset somehow? Thanks


Expert Reply:

The message you are seeing on your Hayes G2 Brake Controller part # HA81792BB indicates that there is a short on the brake output circuit of the brake controller. Since it is showing this code with the trailer disconnected that would mean the problem is on the truck like you suspected.

Commonly this is due to corrosion on the trailer connectors. This can be fixed by hitting the connector with some fine grit sandpaper.

Aside from that you will need to trace the wiring from the brake controller basically back to the7-way looking for any obvious signs of a short like exposed or cut wire and fixing as necessary.

expert reply by:
Jameson C

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