2004R install- Need Help -Electrical question
Thread Starter
Racer
Joined: Oct 2005
Posts: 457
Likes: 1
From: Royal Oak Michigan
2004R install- Need Help -Electrical question
1980 L48 (was 350 auto) now 2004R auto
Can anyone give me some help in locating the brakelight wire and where it is runs from the engine compartment to the back.
The 2004R install instructions say I need to splice into this wire and I am trying to figure out where is the best place to do it at- but I cannot figure out which one it is?
Darrel1
Can anyone give me some help in locating the brakelight wire and where it is runs from the engine compartment to the back.
The 2004R install instructions say I need to splice into this wire and I am trying to figure out where is the best place to do it at- but I cannot figure out which one it is?
Darrel1
Melting Slicks
Joined: Aug 2003
Posts: 2,135
Likes: 2
From: Dayton Oh
I'm not familar with an 80 but on my 79 the break light switch is located underneath the dash and on the bracket that holds the brake petal. The switch has a plunger that makes contact with the brake petal arm. Pressing down the petal allows the plunger to extend.
Thread Starter
Racer
Joined: Oct 2005
Posts: 457
Likes: 1
From: Royal Oak Michigan
Darrel1
Melting Slicks
Joined: Aug 2003
Posts: 2,135
Likes: 2
From: Dayton Oh
Not really. I installed a BTO 2004R on my 79 and had only to worry about the TC lockup. So all I did was splice on the "out" lead of the brake wire at the break switch. This spliced wire then runs to a relay that subsequently runs to the tranny. What happens is that when the brakes are pressed, the spliced wire is only energizing a relay that then stops power going to the TC. If the brakes are not pressed, the relay supplies voltage to the TC allowing it to lockup.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
OK, what is happening is in my '72 here and most GMs of the era....the orange wire on that switch is fused forlights, and allways hot....the white wire gets activated to rear brake lights.....12 volts, problem is, that is just exactly the OPPOSITE of what you need, SO, I put a relay in there to OPEN some contacts feeding 12 to the tranny input....no other way to do it easy....I could use a power transistor good for an amp or so, but to explain that on the forum is nearly impossible...just use a radio shack 12 volt coil relay.....
Melting Slicks
Joined: Aug 2003
Posts: 2,135
Likes: 2
From: Dayton Oh
OK, what is happening is in my '72 here and most GMs of the era....the orange wire on that switch is fused forlights, and allways hot....the white wire gets activated to rear brake lights.....12 volts, problem is, that is just exactly the OPPOSITE of what you need, SO, I put a relay in there to OPEN some contacts feeding 12 to the tranny input....no other way to do it easy....I could use a power transistor good for an amp or so, but to explain that on the forum is nearly impossible...just use a radio shack 12 volt coil relay.....
See this diagram from BTO:
http://www.700r4.com/tech/tcc/relay_.../diagram.shtml
Last edited by marshrat99; Apr 23, 2007 at 12:18 PM.
Thread Starter
Racer
Joined: Oct 2005
Posts: 457
Likes: 1
From: Royal Oak Michigan
Not really. I installed a BTO 2004R on my 79 and had only to worry about the TC lockup. So all I did was splice on the "out" lead of the brake wire at the break switch. This spliced wire then runs to a relay that subsequently runs to the tranny. What happens is that when the brakes are pressed, the spliced wire is only energizing a relay that then stops power going to the TC. If the brakes are not pressed, the relay supplies voltage to the TC allowing it to lockup.
Darrel1
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
It should be white....check with your lightbulb or voltmeter....that activates the relay coil, opening a contact set removing 12 volts from the tranny TCC circuit....the other side of the TCC is grounded through either a 4th gear switch OR the FI computer, thereby locking the converter....
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Thread Starter
Racer
Joined: Oct 2005
Posts: 457
Likes: 1
From: Royal Oak Michigan
Are you saying that I can use the same wire thats already there -clip the old connector off and attach the new connector and I am done with the wiring?
BTO never told me this??
Darrel1
Thread Starter
Racer
Joined: Oct 2005
Posts: 457
Likes: 1
From: Royal Oak Michigan
BTO said to change out the pin connector, get the car into 4th and see if the TC will unlock with touching the brake. Should see about a 300 rpm jump if it does unlock. If not then the TC is not locking up!!.
Thanks-
Darrel1