78490 Chevy GMC Supplemental Over Voltage Fix Harness Western Fisher Snowex Blizzard

This is used for Fisher, Western, Blizzard and Snowex plows.

Here is an update kit for some of the 2014 and later Chevy and GMC trucks that came with the plow prep package. The trucks have a voltage overload when you use the plow and let off the controller. This adds a 3rd plug to your 2 plug Fleet Flex plow and corrects the problem. What happens is the overload causes the truck to shut down the dash and radio to protect itself.

Before installing this kit you will need to get the GM UI Bulletin #124b. This is for trucks that have the snow plow prep package because they have the larger alternator.

You will need the GM harness kit 84043394 (this should come in the glove box of a new truck.)

Here is a link to the Install Instructions for this kit.

If you notice an intermittent resetting of the instrumental panel on your truck when changing the plow position, check this bulletin for an explanation and solution.

The plow side of this harness just connects to the positive and negative terminals on the pump motor. The vehicle side taps in to the GM supplied harness 84043394.