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Wiring harness diagram for 1990 c1500 gmc truck

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Posted on Jan 02, 2017

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SOURCE: Wiring 7 pin trailer plug for 1998 C1500 pickup truck Z71

Here is some information that I find useful when wiring trailer connectors, and the brake controller should be wired into the vehicles wiring according to the instructions that came with the brake controller and that identifies each wire from the brake controller.

Be sure that you solder all connections well for the best operation, and you should use 10 or 12 ga. wire for the Pos. (+) connection, and the ground or Neg. (-) connection, and you should run both wires all the way out to the battery, and about one foot from the battery on the Pos. (+) wire to the battery, make sure that you use a 20 or 30 amp Circuit Breaker and Do Not Use A Fuse.

The rest of these diagrams should help you to get your trailer properly wired up.





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Posted on May 15, 2010

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I'm not sure what you want on the "wiring" part??

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http://www.2carpros.com/car_repair_information/year/1990/make/chevrolet/model/pickup/1990_chevrolet_pickup_drive_belt_routing_diagram.htm

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1990 c1500


Yes, it will fit.Years that fit are 89 to 94.Appearance may be different it steering wheel between a chev or gmc,but wiring should be a exact fit.Other differences in columns are column shift(auto)w/tilt or w/out tilt wheel or floor shift(standard)w/tilt or w/out.

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