1970 Roadrunner 4 speed reverse switch issue

Does anyone have information on how to get the reverse shifter in the transmission to make contact with the reverse switch ball so back up light will turn on. The switch is good, wiring good, bulbs good, there just isn't any contact with the switch to close the circuit and I'm not sure how to make the adjustment. HELP!

There are two adjustments to be made; first, there is a shift lever stop set bolt & nut on the base of the shifter, to set the travel of the reverse leakage. Second, there is an adjustment on the reverse shift rod. Do this, remove the reverse rod from the shifter, and manually, by using a wrench on the reverse gear shifter shaft and notice the travel of the shaft. It should close the circuit and your reverse light should work. In addition, try to place the rod back into the shifter it should go in without moving the shifter; if not, again you must adjust the shifter and rod. If none of this solves your problem there is something wrong with your reverse shifter shaft and detent plate inside the transmission.

In these pictures, my shifter is a Mr. Gasket Vertigate, however, most 4 Speed shifter operate on the same basic principle.

ALTERNATOR SERPENTINE PULLEY PROBLEM
SOMETHING YOU SHOULD KNOW- I’m assembling a 512 street engine, as you can see in my avatar, for my 1970 Plymouth Roadrunner. I decided to install a serpentine system for the water pump, and alternator using the lightweight Denso 60 amp alternator. I ordered these pulleys, crankshaft, water pump, and an alternator, plus the 6 grooved belt, from 440 Source. I discovered the serpentine pulley for the alternator was for the factory style alternator and could not be used on the Denso alternator. I solved the problem by ordering a 6 grooves pulley from Maniac Electric Motor, part #79909033, 15mm ID, 58mm OD pulley. Also, I had to fabricate a special tool to secure the 7/8 nut and tighten the 10mm shaft nut. Hopefully, this will help someone if they decide to use this system.

Just an FYI... 1970 B-body is it's own dash "reverse" lamp. It has a ground on it since the panel it goes into is Plastic. So if you have an aftermarket or another type that has the single wire it will never work...

QuickBpBp said:

Just an FYI... 1970 B-body is it's own dash "reverse" lamp. It has a ground on it since the panel it goes into is Plastic. So if you have an aftermarket or another type that has the single wire it will never work...

Click to expand...

I had this problem with my '69. A previous owner had slapped in an aftermarket stereo and butchered the wiring from the fuse block. On the '69, the hot wire for the reverse light sources the radio power source at the radio power connection inside the dash. (Red, White and Orange wires going into a "T" shaped connector.) Once reconnected to the fuse block, the switch is energized and the amber under dash reverse light and rear bumper reverse lights became functional. Make sure the lights, and connections are free from rust and corrosion.