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ok, anyone know what this is.......


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Jack what we have here is an manual electric trailer brake!!!

When your truck was used to pull a electric braked trailel eg a M14, then you could brake the trailer alone going down steep hills or brake together with the hydraulic brakes on the GMC.


Your M3 halftrack has an electric brake as well...this one is working with a mechanical delay when you press the brake pedal.


the 4th wire on your trailer connector is for this electric brake! The black knob is to adjust the sensitivity of the brake according to the load of the trailer. This knob is on the dashboard of your halftrack!


So not all of the CCKW's where equiped with this feature!

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