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Thread: Lost speedometer and transmissions shifts when deleting 97 c1500 pcm...

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  1. #1

    Lost speedometer and transmissions shifts when deleting 97 c1500 pcm...

    anyone know where i can find the speedometer wire for the cluster? is it on the c100 firewall plug?
    97 xcab c1500 lm7 5.3 swap 343RWHP 329RWTQ 13.40 @ 101.97 2.03 60ft. MODS: Longtubes, 3200 stall, TR220 112lsa, .030 799 heads, NNBS intake, PTM 92mm TB. 4" PVC "hot" air intake 3" single exhaust w/cutout 3.42:1 gears, 29" tall tires. Dyno tuned by flaco

  2. #2
    need to figure this out asap.. does anyone have a pinout for the c100 connector? i can't find it on search engines. I need tach/ Speedometer and im set guys...

    thanks in advance.
    97 xcab c1500 lm7 5.3 swap 343RWHP 329RWTQ 13.40 @ 101.97 2.03 60ft. MODS: Longtubes, 3200 stall, TR220 112lsa, .030 799 heads, NNBS intake, PTM 92mm TB. 4" PVC "hot" air intake 3" single exhaust w/cutout 3.42:1 gears, 29" tall tires. Dyno tuned by flaco

  3. #3
    B5 on the c100 connector should be for the speedo. if you look in my build thread i have 2 c100 diagrams, 1 for 96 & 1 for 98. i know 96 & 98 are different but i'm not sure about 97. either way, the speedo connection is the same.

    the tach will either be B2 or E8

  4. #4
    Quote Originally Posted by RPM Graphics View Post
    B5 on the c100 connector should be for the speedo. if you look in my build thread i have 2 c100 diagrams, 1 for 96 & 1 for 98. i know 96 & 98 are different but i'm not sure about 97. either way, the speedo connection is the same.

    the tach will either be B2 or E8
    i screenshot your picture post in your thread last night, Any idea what the TCC wire is? It says it's white A1 on there but i remember it being a different color when i unplugged it from the black pcm
    97 xcab c1500 lm7 5.3 swap 343RWHP 329RWTQ 13.40 @ 101.97 2.03 60ft. MODS: Longtubes, 3200 stall, TR220 112lsa, .030 799 heads, NNBS intake, PTM 92mm TB. 4" PVC "hot" air intake 3" single exhaust w/cutout 3.42:1 gears, 29" tall tires. Dyno tuned by flaco

  5. #5
    started gutting the vortec harness today, only pulled loose stuff, left temp sensor wire, oil pressure, Starter lead, AC lead and i want to keep the neutral safety switch since i heard that is where the reverse lights operate, any insight on this?
    97 xcab c1500 lm7 5.3 swap 343RWHP 329RWTQ 13.40 @ 101.97 2.03 60ft. MODS: Longtubes, 3200 stall, TR220 112lsa, .030 799 heads, NNBS intake, PTM 92mm TB. 4" PVC "hot" air intake 3" single exhaust w/cutout 3.42:1 gears, 29" tall tires. Dyno tuned by flaco

  6. #6
    i'm not using a neutral safety switch right now. i'm using the trans from a camaro & the NSS from the truck won't work on it until i swap out the shaft for the linkage.
    on the truck harness i pretty much pulled/cut everything that went to the truck ECU.

  7. #7
    Join Date
    Dec 2010
    Posts
    181
    Quote Originally Posted by greenvortec View Post
    started gutting the vortec harness today, only pulled loose stuff, left temp sensor wire, oil pressure, Starter lead, AC lead and i want to keep the neutral safety switch since i heard that is where the reverse lights operate, any insight on this?
    Helpful info, thanks! Having a nightmare of a time trying to figure out the truck side wiring for my swap.

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