Auto & manual Gauge Harness ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70GMCer · 06-23-2005, 06:17 PM

What is the differance between an Auto & Manual dash harness w/gauges? I've change to auto and really see no differance between the two, other than the column safety switch. Will there be a problem with using my old harness?

**68 Stepside** · 06-23-2005, 09:48 PM

My truck was orignally a 250 I6/3 spd, and is now a SBC/auto. Other than being able to start the truck in any gear, I haven't noticed any significant difference in the wiring harnesses. My truck also has gauges.

**Smitty** · 06-23-2005, 11:06 PM

I didn't change my harness when I went Auto! I changed the plug for the back up lights. Which also go through the neutral safety switch. But don't remember how I ran the wires for the rest of the connection. But it works, only starts in Park and Neutral and the back up lights do work! Don't remember it being real hard.

**JIMs70GMC** · 06-24-2005, 04:36 AM

I went the opposite way and the only issue I had were the back-up lights and neutral safety switch. I put an auto cab on a manual chassis, I also used the manual engine wiring harness. To add to it at the same time I went from GMC front to Chevy.

70GMCer · 06-24-2005, 05:53 AM

Thanks, that's what I was thinking.....I am putting in a "Lokar" backup light switch on the transmission and just going to hook back up my harness.......Thanks again guys...

06-23-2005, 06:17 PM	#1
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Auto & manual Gauge Harness ? What is the differance between an Auto & Manual dash harness w/gauges? I've change to auto and really see no differance between the two, other than the column safety switch. Will there be a problem with using my old harness? __________________ 1997 GMC Sierra Ext 1965 Mustang

06-23-2005, 09:48 PM	#2
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	My truck was orignally a 250 I6/3 spd, and is now a SBC/auto. Other than being able to start the truck in any gear, I haven't noticed any significant difference in the wiring harnesses. My truck also has gauges. __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

06-23-2005, 11:06 PM	#3
Smitty Senior Member Join Date: Dec 1999 Location: Spring Valley, Ca. Posts: 1,111	I didn't change my harness when I went Auto! I changed the plug for the back up lights. Which also go through the neutral safety switch. But don't remember how I ran the wires for the rest of the connection. But it works, only starts in Park and Neutral and the back up lights do work! Don't remember it being real hard. __________________ Smitty '71 Short Fleetside Spring Valley, Ca.

06-24-2005, 04:36 AM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I went the opposite way and the only issue I had were the back-up lights and neutral safety switch. I put an auto cab on a manual chassis, I also used the manual engine wiring harness. To add to it at the same time I went from GMC front to Chevy. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

06-24-2005, 05:53 AM	#5
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Thanks, that's what I was thinking.....I am putting in a "Lokar" backup light switch on the transmission and just going to hook back up my harness.......Thanks again guys... __________________ 1997 GMC Sierra Ext 1965 Mustang



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