Hooking up reverse lights to a TH400 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KD4UPL · 05-31-2014, 08:45 PM

My truck is a combination of many different ones. It has a TH400 auto trans. The previous owner was just using a toggle switch to turn on the back-up lights.
Should this be hooked to a switch in the transmission or on the shifter?
The transmission has a 1/4" male terminal on the drivers side down low. I assumed it was the switch I was looking for and since it only had 1 terminal it grounded it when reverse was selected. I connected my test light from the batt. pos. to this terminal but it's grounded no matter what gear the trans. is in.
If this isn't the back-up light terminal where is it?
Also, the truck will start in any gear; where's the park/neutral start switch located?

05-31-2014, 08:45 PM	#1
KD4UPL Registered User Join Date: Jun 2012 Location: Swoope, VA Posts: 17	Hooking up reverse lights to a TH400 My truck is a combination of many different ones. It has a TH400 auto trans. The previous owner was just using a toggle switch to turn on the back-up lights. Should this be hooked to a switch in the transmission or on the shifter? The transmission has a 1/4" male terminal on the drivers side down low. I assumed it was the switch I was looking for and since it only had 1 terminal it grounded it when reverse was selected. I connected my test light from the batt. pos. to this terminal but it's grounded no matter what gear the trans. is in. If this isn't the back-up light terminal where is it? Also, the truck will start in any gear; where's the park/neutral start switch located? __________________ 1987 S-10 Blazzer Sold, 1986 GMC Jimmy Sold, 2002 Chevy 2500 HD 2wd, 6.0, auto. Sold, 2007 Chevy 3500 SRW 4wd D/A Sold, 2005 Chevy 3500 4wd CC, D/A, dually, 2001 Chevy 3500 4wd EC, 8.1/A dually, 1969 Chevy C10 short bed, 307 V8



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