Depinned engine harness --- now ... ??

[ls1nova71]

Do you have a NSS on your steering column or shifter somewhere? If so you can just use that, or you can use the one bolted to the transmission, but you'll need a relay to use it. The benefit to the trans mounted one is it's more precise and always works in park and neutral where as a column mounted one can be somewhat vague due to the slop in the linkage.

[FAKKY]

Originally Posted by ls1nova71

Do you have a NSS on your steering column or shifter somewhere? If so you can just use that, or you can use the one bolted to the transmission, but you'll need a relay to use it. The benefit to the trans mounted one is it's more precise and always works in park and neutral where as a column mounted one can be somewhat vague due to the slop in the linkage.

Thats the one I want to use. OEM. Do have one of the floor shifter but rather use the integrated OEM one as the shift is ok ... but.

Just trying to work out which wire provides ground out of that.
Also ..... with the relay ......

30 - 12v power from battery with (inline fuse/fuseable link ) ?
86 - wire from key ignition.
87 - goes to purple starter wire in harness to give 12v on crank.
85 - ground from NSS .. not sure which wire

Best way to protect that circuit (fuseable link) and what amperage relay etc ?
Think the purple wire is a 12awg which I think is max 41A.

https://www.amazon.com/Pico-8124PT-G...3463780&sr=1-9


https://www.amazon.com/ARTGEAR-Harne...omotive&sr=1-5

[ls1nova71]

I use fuses. The battery power to the relay on terminal 30 gets a 40a fuse, the purple wire coming from the ignition switch gets a 10a fuse, then that wire goes to pin 12, a pink wire on the NSS plug. Pin 1, a green wire coming out of the NSS plug then goes to terminal 86 on the relay. Terminal 85 will go to ground, and 87 will go to the starter solenoid. I also generally use 40a relays.

[FAKKY]

Originally Posted by ls1nova71

I use fuses. The battery power to the relay on terminal 30 gets a 40a fuse, the purple wire coming from the ignition switch gets a 10a fuse, then that wire goes to pin 12, a pink wire on the NSS plug. Pin 1, a green wire coming out of the NSS plug then goes to terminal 86 on the relay. Terminal 85 will go to ground, and 87 will go to the starter solenoid. I also generally use 40a relays.

Thanks.
Ok a little more confused on that setup - do you have a pic on the web thats similar ? Sorry obviously a little noob on most things ..... but wiring especially at times.

I think Ive seen some multi relay - fuse block setups on youtube but thnk generally they have 1 fuse on the power side only for each relay.


https://www.youtube.com/watch?v=BvFHA1xY10w


Anyway - back to the pinouts .......

Is there somewhere that explains that --- Im guessing you know how to read a full wiring schematic properly ...... so you knew hoe to do that ? Just I havent read it anwhere ..... and my chances of getting a schematic right are about as good as kansas winning the NCAA right now.

And If I get it wrong - assuming truck wont start

-- I found an old thread of yours .....

http://67-72chevytrucks.com/vboard/s...d.php?t=615830

but havent seen many people talking about this in other threads - do most people not wire the NSS ?

[ls1nova71]

What part do you not understand? That drawing g I made in the thread you linked shows it pretty good.

[FAKKY]

Originally Posted by ls1nova71

What part do you not understand? That drawing g I made in the thread you linked shows it pretty good.

Drawing is awesome.
Here are the parts not understanding.

1) I didnt find a single thread explaining that wiring until I searched on some keywords you provided on pinout of the OEM NSS. So Im guessing most people dont do it this way - they just use a column/floor shift with a 2 wire setup that prevents the starter from cranking ?

2) How did you work out that was the way to wire it ? Eg Having the ignition switch going to Pin12 of the range sensor and that that would work ? Just experience and reading schematics and understanding circuitry better ?

eg I was searching on Pin #34 as that was what was registered at LT1swap.

"Transmission Range Switch Signal P (A/T) PCM can be programmed to accept a SINGLE WIRE park/neutral signal on this PIN, if no trans mounted range sensor is present" <== but guessing this is if your using an aftermarket shifter with NSS ?

So - just not sure how you worked that out - except for being just clever Read for 4 hours on this. Found nothing.

3) Not clear on how you fuse every wire on each pin of the relay. Physically how is that done.

Thx nova/e015475all ....... / none of this would get done without learning from you lot.

[ls1nova71]

Originally Posted by FAKKY

Drawing is awesome.
Here are the parts not understanding.

1) I didnt find a single thread explaining that wiring until I searched on some keywords you provided on pinout of the OEM NSS. So Im guessing most people dont do it this way - they just use a column/floor shift with a 2 wire setup that prevents the starter from cranking ?

I think a lot of people either don't use a neutral safety switch or just use the one originally on the column.

2) How did you work out that was the way to wire it ? Eg Having the ignition switch going to Pin12 of the range sensor and that that would work ? Just experience and reading schematics and understanding circuitry better ?

I got the info from the factory service manual wiring diagrams. And yes, it does help if you know how to read a schematic, but I can try and walk you through it. Wiring isn't a lot of peoples strong point that's for sure!

eg I was searching on Pin #34 as that was what was registered at LT1swap.

"Transmission Range Switch Signal P (A/T) PCM can be programmed to accept a SINGLE WIRE park/neutral signal on this PIN, if no trans mounted range sensor is present" <== but guessing this is if your using an aftermarket shifter with NSS ?

This is for the info the computer uses and not for the other functions of the transmission range sensor. LT1swap only gives you the wiring needed to make the engine run. Back up lights and NSS functions are not included in his site because it would overwhelm most people.

So - just not sure how you worked that out - except for being just clever Read for 4 hours on this. Found nothing.

3) Not clear on how you fuse every wire on each pin of the relay. Physically how is that done.

There are a couple ways to fuse the relay, either inline fuses or in a fuse block. you would need to figure out where you are going to put the relay, then mount the fuses close to that. Where is your fuse block for the engine harness located? You could just put it in the same location to make it easier.

Thx nova/e015475all ....... / none of this would get done without learning from you lot.

Answers in bold. Hope this helps. If I made it worse, just let me know and I'll try and clear it up.