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04-11-2019, 06:33 PM | #1 |
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TCC Brake Switch Wiring
I've been researching but haven't been able to find a definite answer. I've got a Gen III LS and a 4-prong brake switch and will be installing LED tail lights. On my dad's Gen IV with a 2-prong brake switch, we installed a 470 ohm resistor but we did that so the TCC wire would see 12v. With my 4-prong switch, is that necessary? Below is the wiring diagram from PSI. I will be connecting the red to switched 12v, purple to TCC wire out of the PCM, and white and orange to the brake switch wiring from my American Autowire harness. Do I need to install a resistor inline on the white or orange wire for the tail light wiring?
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
04-11-2019, 07:24 PM | #2 |
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Re: TCC Brake Switch Wiring
No resistor needed. Just hook it up the way you described.
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My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
05-21-2019, 06:46 PM | #3 | |
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Re: TCC Brake Switch Wiring
Quote:
Is it the same as keyed or ignition? I'm wiring in this same part with LED taillights for my LS swap. Thanks for asking the question MDPotter.
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Chuck Instagram: c_lo_garage Check out my 1966 C10 project "El Viejito" here: http://67-72chevytrucks.com/vboard/s...d.php?t=674614 |
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05-21-2019, 07:01 PM | #4 |
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Re: TCC Brake Switch Wiring
Vehicles run off 12v. It's not really necessary to mention it in posts, but we still do. Switched means that the source is hot with the key in run and crank position and not hot when in accessory of off. With LS harnesses, pink wiring is switched and orange is constant (battery) hot.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
05-22-2019, 11:29 PM | #5 |
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Re: TCC Brake Switch Wiring
Keep us posted on your results for the TCC
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
05-23-2019, 10:55 AM | #6 | |
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Re: TCC Brake Switch Wiring
Quote:
Are you by any chance running LED lights?
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Chuck Instagram: c_lo_garage Check out my 1966 C10 project "El Viejito" here: http://67-72chevytrucks.com/vboard/s...d.php?t=674614 |
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05-23-2019, 11:19 AM | #7 |
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Re: TCC Brake Switch Wiring
Yes, we installed LED tails on my dad's 64 Gen IV swap and I will be installing LED tails on my 68 Gen III swap.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
05-23-2019, 11:59 AM | #8 | |
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Re: TCC Brake Switch Wiring
Quote:
I want to see if the problem is fixed by having the brake switch hooked up, but have you experienced any issues like that? I know the taillight bucket is grounded once installed, but should I run a separate ground to the taillights? The driver side works just fine. Also I installed LED flashers (with the built in ground) and the blinkers speed is slow and steady, like it should be.
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Chuck Instagram: c_lo_garage Check out my 1966 C10 project "El Viejito" here: http://67-72chevytrucks.com/vboard/s...d.php?t=674614 |
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05-23-2019, 12:14 PM | #9 |
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Re: TCC Brake Switch Wiring
I don't see why you couldn't add a resistor for the tails, we had to for them to work along with the LED flasher. The reason for the resistor on the 64 is because the PCM couldn't see the voltage because the draw from the LED tails was so low.
We didn't run a separate ground and it works just fine - nice and bright. It grounds through the socket in the taillight housing and then through the screws into the taillight housing in the bedside. So make sure that socket is clean - take a piece of emery cloth or sandpaper so things are making good contact. Without a good ground, lights on these trucks don't work. It's possible that your issue is just a ground issue, we had the same problem.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
05-23-2019, 12:48 PM | #10 | |
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Re: TCC Brake Switch Wiring
Quote:
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Chuck Instagram: c_lo_garage Check out my 1966 C10 project "El Viejito" here: http://67-72chevytrucks.com/vboard/s...d.php?t=674614 |
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03-04-2020, 07:48 PM | #11 |
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Re: TCC Brake Switch Wiring
Potter, are you going to have cruise control? I was told to add resistance to the wire(I used a relay instead of resistor) on the white wire on brake switch because i'm using LED lights plus DBW CC. The cruise needs to see 12 volts to kick off and the LED lights supposedly don't draw enough voltage for the TAC module to see it.
Here is LS1Nova71 post on this: http://67-72chevytrucks.com/vboard/s...d.php?t=511477
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03-05-2020, 10:21 AM | #12 |
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Re: TCC Brake Switch Wiring
No cruise control for me. I would follow what ls1nova says, he knows his stuff.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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