Simple ls wiring questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

upon1 · 01-31-2014, 01:10 PM

I'm putting a 5.3/4l60e in my '54 and can't get a hold of the guy that built my harness. I'm using a haywire chassis harness and a universal ignition switch. And a lokar shifter
Couple questions:
I have a wire labeled neutral safety, I don't have any connectors for the factory gear indicator on the drivers side of the trans. Where does this go?

Do I need to hook the brake switch wire up to get it running?

Thanks in advance.

mooseknuckles · 01-31-2014, 03:01 PM

It will run without those hooked up....if you're using a lokar gear indicator you can wire the neutral safety into that...the brake switch wire gets spliced into a wire on the brake switch...I did have a pic saved....

BR3W CITY · 01-31-2014, 04:12 PM

The gear indicator can be left unused if you want, I removed that whole section of trans harness.

I would hook up the brake wire before starting though, unless your JUST going to do a stationary start. I don't like the vehicle moving or using any trans functions without the brake switch input (plus the TAC will want the TCC functions hooked up if its dbw)

solidaxel · 01-31-2014, 04:27 PM

Quote:

Originally Posted by BR3W CITY

The gear indicator can be left unused if you want, I removed that whole section of trans harness.

I would hook up the brake wire before starting though, unless your JUST going to do a stationary start. I don't like the vehicle moving or using any trans functions without the brake switch input (plus the TAC will want the TCC functions hooked up if its dbw)

Good to know about the TCC and the TAC, first time I heard that one.

BR3W CITY · 01-31-2014, 06:27 PM

Well one of the wires was labeled TAC, so I kinda figured it was important lol

upon1 · 01-31-2014, 07:11 PM

It is the DBW. Will it run without it connected? I don't have a lokar gear indicator, just the nss on the shifter

BR3W CITY · 01-31-2014, 09:42 PM

Yes it will run, but you may run into some issues with the trans or the dbw control without it connected. The tcc will refuse to lock/unlock without a reference from the switch. I'm not 100% WHAT the Tac looks for, but considering how sensitive DBW can be, I wouldn't be surprised if it wanted to see it connected.

Just to start and idle its not a requirement.
You do need VATS etc turned off at the pcm either way.

01-31-2014, 01:10 PM	#1
upon1 Registered User Join Date: Oct 2007 Location: Saskatoon Posts: 138	Simple ls wiring questions I'm putting a 5.3/4l60e in my '54 and can't get a hold of the guy that built my harness. I'm using a haywire chassis harness and a universal ignition switch. And a lokar shifter Couple questions: I have a wire labeled neutral safety, I don't have any connectors for the factory gear indicator on the drivers side of the trans. Where does this go? Do I need to hook the brake switch wire up to get it running? Thanks in advance. __________________ "Lifes to short to drive an ugly truck." Project 55 To Life http://67-72chevytrucks.com/vboard/s...d.php?t=432994

01-31-2014, 03:01 PM	#2
mooseknuckles Registered User Join Date: Sep 2009 Location: ottawa,canada Posts: 4,550	Re: Simple ls wiring questions It will run without those hooked up....if you're using a lokar gear indicator you can wire the neutral safety into that...the brake switch wire gets spliced into a wire on the brake switch...I did have a pic saved.... __________________ my build threads '86 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415628 '67 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=635078 '63 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=674682

01-31-2014, 04:12 PM	#3
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Simple ls wiring questions The gear indicator can be left unused if you want, I removed that whole section of trans harness. I would hook up the brake wire before starting though, unless your JUST going to do a stationary start. I don't like the vehicle moving or using any trans functions without the brake switch input (plus the TAC will want the TCC functions hooked up if its dbw) __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

01-31-2014, 06:27 PM	#5
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Simple ls wiring questions Well one of the wires was labeled TAC, so I kinda figured it was important lol __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

01-31-2014, 07:11 PM	#6
upon1 Registered User Join Date: Oct 2007 Location: Saskatoon Posts: 138	Re: Simple ls wiring questions It is the DBW. Will it run without it connected? I don't have a lokar gear indicator, just the nss on the shifter __________________ "Lifes to short to drive an ugly truck." Project 55 To Life http://67-72chevytrucks.com/vboard/s...d.php?t=432994

01-31-2014, 09:42 PM	#7
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Simple ls wiring questions Yes it will run, but you may run into some issues with the trans or the dbw control without it connected. The tcc will refuse to lock/unlock without a reference from the switch. I'm not 100% WHAT the Tac looks for, but considering how sensitive DBW can be, I wouldn't be surprised if it wanted to see it connected. Just to start and idle its not a requirement. You do need VATS etc turned off at the pcm either way. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

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