Reverse

[GTS NOSE CONE]

Just got a 71 Demon and the car was a automatic now its a 4 speed. Previous owner has no wiring or plug on the reverse light but I want it toward. There are wires going to the rear reverse lights but nothing forward to the transmission. Whats my best way to get this going

 

[dadsbee]

Is the neutral safety switch plug / wiring still hanging around somewhere from the automatic?? The outer two wires are your reverse light circuit. Clip, 1/4" spades and put them onto the A833's switch.

 

[GTS NOSE CONE]

No there's nothing there at all someone must of pulled it all out. Where do you get power from the fuse block on the fire all anyone have a picture of where the power comes from

 

[Mattax]

It's in the service manual.
Go to mymopar.com and download a digital copy.
The wire code for back-up lights is B.
The tricky part of the diagram will be identifying the option for 3 speed and 4 speed vs automatic.

edit.
I thought this seemed familiar. There's a mistake in my text but the drawing is taken from the service manual diagram. Power to the switch is from wire B1 coming out of cavity W. Look to see if the passenger side of the connector is wired.

Post in thread '4 spd reverse indicator light wiring routing'

Oct 14, 2025

Different years had different solutions.

Here's whats in the '71 plymouth FSM

^That is power to the lamp

lets look at C

In the engine bay, C holds the next segment of wire B2.
This comes from the switch.
At the connector branch B2A goes to cavity W
Power comes from wire B1 which comes from cavity Z

According to the diagram, grommets are used for the clutch safety switch and the tach.
What you find on a vehicle will confirm this to be correct or not.

• Mattax

 

[GTS NOSE CONE]

thank you

 

[CRUZE 418]

There's a harness available for that. Plus if you want the under dash reverse lamp. It's all in the factory service manual wiring diagram.

 

[GTS NOSE CONE]

I just got this reverse light harness from classic but why so many connectors I know one goes to the bulkhead and the one on the reverse switch but how about the others ??

 

[CRUZE 418]

Not sure if you have the correct harness, having said that, I realize that my '69 has the '71 harness. Mine is wired different than yours. It was confusing, I have no violet wire, black. Your car should be like Mattax's wiring diagram. Power is out of the W port? Mine is above the C port, D. The Z port goes into the reverse light under the dash. Recheck your harness is correct and follow Mattax's diagram. Do you have a '71 Factory Service Manual? What kind of shape are your car wiring harnesses in? Are they all hacked up or the car rewired with a do it yourself universal wiring harness?

 

[GTS NOSE CONE]

the wiring on this car is all butchered up dont know why they did that to it

 

[CRUZE 418]

Well, this is me, others will argue, but you have about 3 choices. One, replace all of your wiring with new M&H or Evans. Two, get one of those Painless do it yourself kits, which isn't really up everyone's alley. Two of my cars were hacked, I replaced all of it with M&H. Expensive now days, but absolutely no regrets for doing it, your orginal hacked wiring is 54 years old. Three, try to sort out what you have and repair it. If you decide to go new, pm me.