The Infamous "Purple Wire"...

[LS1GMCTruck]

Thanks a lot fellas...I need to go over my wiring again. Gar

[LS1GMCTruck]

NITROUS & RedHeartBeat, Well...I went over this fuel pump relay wiring thing again. I could not believe what my problem was! It was the black/w white stripe ground wire coming off the bottom of the relay. It was a bad ground! I'm a putz! Can't believe it was such a basic thing.(is'nt that usually the case?) Gave it a good ground & the thing fired right up. Ran rough for a couple of minutes & cleared right up. Idles right down & is VERY smooth now. These things have got some good throttle response! For the last twenty-five years I have built offshore powerboats for a living, for companies you may have heard of...Apache, Velocity, Powerplay, etc..I have heard my share of healthy sounding motors with crisp throttle response. These LS1's are pretty nice running motors, I will say that. Thanks again guys for all your help. Gar

[NITROUS]

Glad you worked it out bro!!

[LS1GMCTruck]

NITROUS, When you get a chance(no hurry) can you get me the part number for that longer 4L60E shift shaft/nuetral safety switch "kit" that you mentioned before? Mucho Gracious. Gar

[NITROUS]

I'll see if I still have the box. If not I can get it from the dealership. I know there were 4 different kits offered.

[NITROUS]

I think this is the part number if I remember correctly. #15724078 I'll still try when I get home.

[LS1GMCTruck]

Thanks NITROUS! On to temperature gauge function. What did you use for a temperature sender for your factory dash gauge? I was doing a little research & it looks like I just need to go buy a second factory LS1 cylinder head temp sender, which is a two prong sender(?), connect one prong to ground & the other to the dash gauge. Is this the way to go, or??? P.S... Welded up a 2 1/2" dual exhaust, going into a single MagnaFlow dual muffler, to get me around. Sounds much better than open headers! The wife appreciates it too! Thanks, Gar

[NITROUS]

Call S&P. Tell them you need a 3/8 to 12mm adapter for your factory temp sensor. You can pull the plug out of the back of the passenger side head and mount it there with no problems.

[LS1GMCTruck]

<div class='quotetop'>QUOTE(NITROUS &#064; Aug 7 2006, 03&#58;33 PM) [snapback]60283[/snapback]</div>

Call S&P. Tell them you need a 3/8 to 12mm adapter for your factory temp sensor. You can pull the plug out of the back of the passenger side head and mount it there with no problems.
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Thanks NITROUS, just ordered it from S & P. Can&#39;t wait to get it. Today I also figured out the trucks oil pressure wire coming out of the C-100, which is tan, and the water temperature wire, which is green, just as you had said. You ground them with the key on & they peg the gauge. Yup&#33; thats them&#33; Next, I need to figure out why my dual F-body fans are&#39;nt coming on at all. The only thing I can think of is, that I have both keyed power wire sources to the relays, both on one supply wire. Would this make a difference? Wish I had more time every day to play with this, it&#39;s getting very close to drive time&#33; Thanks again, Gar