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'87-91 trailer brake wiring harness laid out on gravel

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Brake Controller Harness for '87-91 Trucks Also available via eBay.

The rubber grommet near the red sticker passes thru the firewall near the e-brake pedal. A second pigtail harness plugs into the round 3-pin connector and splices to the controller's wiring.
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=57184

'80-86 similar