1991 chevy c-1500 brake switch wiring diagram for the 4 pin connector

Here is what i could find on the brake switch let me know if you need anything else, there is quite a few diagrams for the switch...
https://photos.app.goo.gl/9ZG7C2ne2do5zqf9A

Brake Lines parts diagram and parts suppliers. Garages will make the lines and fittings in the shop.

https://www.google.com/search?q=1991+chevy+1500+brake+line+diagram

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Do you know what electrical testing is and how to do it ? apparently not ! Do you know what a wiring diagram is and how to read one ? Is there B+ voltage going into the brake light switch ? Test this first with a DVOM - digital volt ohm meter . If there is , with the brake pedal pressed ,is there B+ voltage coming out of the switch ? Find a diagram of the wiring harness connector locations look at every connector the brake light wires are in > Check voltage at each connector till voltage disapears . find the open wire , high resistance , what ever is cause B+ voltage not to be there . Watch videos on youtube for voltage drop testing . Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia How to read a wiring diagram . Buy a repair manual . Sorry dude , but if you want to fix car's , learn how .

iam not to shure but lots off parts fit if motor the same i think will fit lots off parts from 1988 to 1998

It sounds like someone messed up to me! Apparently, the brake controller got wired into an ignition circuit that it should not have gotten wired to. When accessories are added to a vehicle, it is extremely important that the vehicle wiring diagrams are used so that you know EXACTLY what you are tying into. Some of the Chevy trucks that are sold with trailer towing packages already have the wiring for brake controllers under the dash. This makes installation easy and is already tied into the correct things.

Also see my comments on related subjects HERE

1. connect the red wire to the stop lamp switch lead on the brake control. Connect the other end of red wire to the stop lamp switch in the vehicle using the splice connector

2. connect the blue wire to the trailer brake lead on the brake control. Route the other end of the blue wire to the trailer connector at the back of the vehicle.

3. connect the white wire to the ground lead on the brake control. Route the other end of the white
wire to the vehicle’s battery. Use the ring connector to connect the white wire to the battery’s negative terminal.

4. connect the black wire to the power lead on the brake control. Route the other end of the black wire to the vehicle’s battery. Use the fuse assembly to connect the black wire to the battery’s positive terminal.

Try http://www.etrailer.com/faq-wiring.aspx.

Fuse box is a good place to start, and check under hood for power distribution box with more fuses.

You should be able to access the Prodigy Instructions ie Wiring Diagram At google. Maybe an install video on You Tube. Make sure everything you do is properly fused. Any thing as far as color codes will need to be Prodigy specific. Prodigy may have a 1-800 Tech line. They should be able to E-mail you a PDF file.

if it is the wiring diagram for the Escape you need, here it is:

12 VOLT CONSTANT Connect to BATTERY ONLY STARTER TAN/LIGHT BLUE (+) IGNITION SWITCH HARNESS STARTER 2 N/A IGNITION 1 LIGHT GREEN/PURPLE (+) IGNITION SWITCH HARNESS IGNITION 2 N/A IGNITION 3 N/A ACCESSORY/HEATER BLOWER 1 BLACK/LIGHT GREEN (+) IGNITION SWITCH HARNESS ACCESSORY/HEATER BLOWER 2 N/A KEYSENSE N/A PARKING LIGHTS ( - ) WHITE/BLACK (-) @ SJB, Connector E, Pin 4, See NOTE *1 PARKING LIGHTS ( + ) BROWN (+) @ SJB, Connector C, Pin 19, See NOTE *1 POWER LOCK PINK/WHITE (1-Wire System) See NOTE *2 @ SJB, Connector D, Pin 22, See NOTE *1 POWER UNLOCK Same wire, See NOTE *2 See DIAGRAMS DOOR TRIGGER PINK (-) @ SJB, Connector C, Pin 28, See NOTE *1 DOMELIGHT SUPERVISION USE DOOR TRIGGER TRUNK RELEASE N/A SLIDING POWER DOOR N/A HORN YELLOW/LIGHT GREEN (-) @ SJB, Connector A, Pin 14, See NOTE *1 TACH NOT RED or WHITE/RED @ IGNITION COIL or FUEL INJECTOR WAIT TO START LIGHT N/A BRAKE LIGHT GREEN (+) @ SWITCH ABOVE BRAKE PEDAL FACTORY ALARM DISARM DARK BLUE/LIGHT GREEN (-) @ SJB, Connector D, Pin 3, See NOTE *1 ANTI-THEFT FORD'S SECURILOCK ANTI-THEFT TRANSPONDER SYSTEM TRANSPONDER @ IGNITION SWITCH TUMBLER EXTRA INFORMATION NOTE *1 The SJB (Smart Junction Block) is the FUSE/RELAY BOX on the PASSENGER SIDE of the CENTER CONSOLE. NOTE *2 This vehicle uses a 1-Wire Door Locking System, LOCK requires a (-)Negative thru a 1000 Ohm Resistor and UNLOCK requires a straight (-)Negative