Wiring floor shift reverse lights - The 1947 - Present Chevrolet & GMC Truck Message Board Network

eric8 · 04-16-2022, 02:28 PM

For those who have gone from a 3 on the tree to a 4 or 5 speed floor shift…how did you handle the reverse light wiring? I’m looking heavily at the new Tremec TKX and noticed kits for our trucks come with the reverse light switch and what appears to be a bare wire “pigtail” on the end.
Are you supposed to tap this pigtail in to the wires in the rear light harness under the truck? Or run it in the interior under the carpet to where it plugs into the bottom of the steering column? Does anyone make a factory gm connector to put on the Tremec switch pigtail where this could be plug and play?

eric8 · 04-19-2022, 12:46 PM

Anyone? How is the reverse light wiring for factory floor shifted 4 speeds routed? Does it plug into the same rear light harness that three on the tree and auto trucks plugged into? Or was there a rear taillight harness specific to floor shifted trucks?

**1957 Chief** · 04-20-2022, 03:03 PM

I went from a 3 on the tree to a 6-speed.

Just fine the original reverse light pigtail and wire in the new one. TKX will have the switch on the driver side of the trans. One side of the pigtail needs 12V with ignition on, other will connect to the reverse light wire you already got.

I went from a 3 on the tree to a 6-speed.

Its really simple, don't overthink it. Heck wiring that switch up is a lot easier than swapping everything to make that TKX work.

Bubba

**hatzie** · 04-20-2022, 08:21 PM

The factory 4 speed backup lamp wiring was literally a pigtail that plugged into the backup lamp switch on the transmission and the 2 position plug for the column switch backup-lamp/neutral-safety switch.
The clutch starter interlock switch used a pigtail that ran from the clutch switch to the neutral safety switch plug.

Both of these pigtails are shown in the gm wiring diagrams.

**ghackett1** · 04-09-2023, 06:00 PM

I have a muncie so I used the Hurst reverse light bracket that came with my new shifter and attached it to the stop bolt in line with the reverse rod on the rear of the shifter bracket. Simple set up but works flawlessly. I know You have a different set up but I wanted to mention how the 4 speed set up works on my truck. I connected the end of my switch to the original reverse wire in my harness.

04-16-2022, 02:28 PM	#1
eric8 Registered User Join Date: May 2013 Location: Utopia Posts: 215	Wiring floor shift reverse lights For those who have gone from a 3 on the tree to a 4 or 5 speed floor shift…how did you handle the reverse light wiring? I’m looking heavily at the new Tremec TKX and noticed kits for our trucks come with the reverse light switch and what appears to be a bare wire “pigtail” on the end. Are you supposed to tap this pigtail in to the wires in the rear light harness under the truck? Or run it in the interior under the carpet to where it plugs into the bottom of the steering column? Does anyone make a factory gm connector to put on the Tremec switch pigtail where this could be plug and play?

04-19-2022, 12:46 PM	#2
eric8 Registered User Join Date: May 2013 Location: Utopia Posts: 215	Re: Wiring floor shift reverse lights Anyone? How is the reverse light wiring for factory floor shifted 4 speeds routed? Does it plug into the same rear light harness that three on the tree and auto trucks plugged into? Or was there a rear taillight harness specific to floor shifted trucks?

04-20-2022, 03:03 PM	#3
1957 Chief Proud Vet that loves the USA Join Date: Jun 2016 Location: Beebe, AR Posts: 459	Re: Wiring floor shift reverse lights I went from a 3 on the tree to a 6-speed. Just fine the original reverse light pigtail and wire in the new one. TKX will have the switch on the driver side of the trans. One side of the pigtail needs 12V with ignition on, other will connect to the reverse light wire you already got. I went from a 3 on the tree to a 6-speed. Its really simple, don't overthink it. Heck wiring that switch up is a lot easier than swapping everything to make that TKX work. Bubba

04-20-2022, 08:21 PM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,920	Re: Wiring floor shift reverse lights The factory 4 speed backup lamp wiring was literally a pigtail that plugged into the backup lamp switch on the transmission and the 2 position plug for the column switch backup-lamp/neutral-safety switch. The clutch starter interlock switch used a pigtail that ran from the clutch switch to the neutral safety switch plug. Both of these pigtails are shown in the gm wiring diagrams. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

04-09-2023, 06:00 PM	#5
ghackett1 68 C10 Longbed Join Date: Sep 2006 Location: Naples, Florida Posts: 520	Re: Wiring floor shift reverse lights I have a muncie so I used the Hurst reverse light bracket that came with my new shifter and attached it to the stop bolt in line with the reverse rod on the rear of the shifter bracket. Simple set up but works flawlessly. I know You have a different set up but I wanted to mention how the 4 speed set up works on my truck. I connected the end of my switch to the original reverse wire in my harness.



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