Trailer wiring,anyone know

[Highbeam]

I think the poster is looking for the brake lamp wire to tell the brake controller when to tell the trailer brakes to engage. You can either pull this directly from the brake switch on the pedal or you can follow that wire and tap into it somewhere. On my 98 chevy pickup this activation line was tapped just under the steering column. The guy that installed it happened to know which wire to tap into. This is one of the few times that I would use one of those crimp on wire taps. The power draw will be very minimal since this connection only activates the brake controller which has it's own power source.

Go ahead and wire the truck for a 7-pin connection. Then do as I do and use the adapter to go from 7-pin to four or buy the fancy plug that actually has a 7pin and 4 pin in one plug. It comes stock on 2001 and up GMs and on ford super duties.

On my pickup with the same bumper as your 95 I removed the driver's side license plate light and enlarged the hole to the right size to surface mount the 7-pin connector right into the chrome. It turned out really sharp and puts the plug close to the ball.

 

[Highbeam]

I think the poster is looking for the brake lamp wire to tell the brake controller when to tell the trailer brakes to engage. You can either pull this directly from the brake switch on the pedal or you can follow that wire and tap into it somewhere. On my 98 chevy pickup this activation line was tapped just under the steering column. The guy that installed it happened to know which wire to tap into. This is one of the few times that I would use one of those crimp on wire taps. The power draw will be very minimal since this connection only activates the brake controller which has it's own power source.

Go ahead and wire the truck for a 7-pin connection. Then do as I do and use the adapter to go from 7-pin to four or buy the fancy plug that actually has a 7pin and 4 pin in one plug. It comes stock on 2001 and up GMs and on ford super duties.

On my pickup with the same bumper as your 95 I removed the driver's side license plate light and enlarged the hole to the right size to surface mount the 7-pin connector right into the chrome. It turned out really sharp and puts the plug close to the ball.

 

[RayH]

You're right. Sorry, I read the question completely wrong. I thought he was asking how to convert his 4 to a 7.
Aside from splicing into the brake switch on the pedal or the brake light wire, not much more you can do.

 

[RayH]

You're right. Sorry, I read the question completely wrong. I thought he was asking how to convert his 4 to a 7.
Aside from splicing into the brake switch on the pedal or the brake light wire, not much more you can do.

 

[George2615]

Check your owners manual for the Tahoe. If it was ordered with a tow package the wiring should all be there.
You will need a controller and the male and female plugs for the back. The controller takes the fixed voltage from the brake light circuit and varies the voltage applied to the trailer brakes with an inertia type switch.
Chevy dealer sells the adapter plug that plugs into a socket in the fuse box on the drivers side of the dash fuse panel and wires up to the controller without cutting into your underdash wiring. My Chevy came with the harness folded up in the glove box.
If you dont have tow pkg. you will have to hard wire the controller and run extra wiring along the frame to the back. Its not hard to do, the controller comes with wiring instructions.

George

 

[George2615]

Check your owners manual for the Tahoe. If it was ordered with a tow package the wiring should all be there.
You will need a controller and the male and female plugs for the back. The controller takes the fixed voltage from the brake light circuit and varies the voltage applied to the trailer brakes with an inertia type switch.
Chevy dealer sells the adapter plug that plugs into a socket in the fuse box on the drivers side of the dash fuse panel and wires up to the controller without cutting into your underdash wiring. My Chevy came with the harness folded up in the glove box.
If you dont have tow pkg. you will have to hard wire the controller and run extra wiring along the frame to the back. Its not hard to do, the controller comes with wiring instructions.

George

 

[RobertN]

Marks RV has great wiring info

 

[RobertN]

Marks RV has great wiring info

 

[Highbeam]

Yeah, chevy didn't start doing that until the 99 trucks. Up until then if you had the Z82 heavy duty towing package then you got the hitch and the extra wires run to the rear of the truck for the controller. Your glove box has a sticker with RPO codes and Z82 might be there. For giggles, code G80 is the locking rear differential (Not limited slip or posi) made by eaton, nice to have.

Brake controllers only have four wires. One is the brake light connection and this just activates the controller. Second is a power line from the battery to actually power the trailer brakes, third is the blue wire that leads to the trailer brakes, and then the ground. On a 95 you will need to wire it the old fashioned way, no fancy premade plugs under the dash.

"The controller takes the fixed voltage from the brake light circuit and varies the voltage applied to the trailer brakes with an inertia type switch." Not anymore. The brake light connection only tells the controller to start applying voltage from the battery connection. You will actually need to install an automatic reset circuit breaker for the main power feed.

 

[Highbeam]

Yeah, chevy didn't start doing that until the 99 trucks. Up until then if you had the Z82 heavy duty towing package then you got the hitch and the extra wires run to the rear of the truck for the controller. Your glove box has a sticker with RPO codes and Z82 might be there. For giggles, code G80 is the locking rear differential (Not limited slip or posi) made by eaton, nice to have.

Brake controllers only have four wires. One is the brake light connection and this just activates the controller. Second is a power line from the battery to actually power the trailer brakes, third is the blue wire that leads to the trailer brakes, and then the ground. On a 95 you will need to wire it the old fashioned way, no fancy premade plugs under the dash.

"The controller takes the fixed voltage from the brake light circuit and varies the voltage applied to the trailer brakes with an inertia type switch." Not anymore. The brake light connection only tells the controller to start applying voltage from the battery connection. You will actually need to install an automatic reset circuit breaker for the main power feed.