I have an issue with the right turn signal in my '94 Dodge Ram 1500 pickup. The right turn signal was flashing quickly (and faintly) so, I swapped all the bulbs, but this did not solve the problem.

I also swapped out the turn signal 'flasher' which is located in the fuse box between the driver side door and the dash panel. After replacing the flasher, when I switch on the right turn signal, both rear lights flash (as well as the third light on the back of the cab - like you would expect when using the hazard switch). All other switches and lights are working normally.

I have also replaced the multi-switch in trying to diagnose this issue.

What would cause this type of electrical problem and how can I isolate the problem?

 

As a rule of thumb, if there are lights coming on that shouldn't it's almost always a ground problem. Check the ground at the right tail light.

 

One additional clue that I noticed - when the brake is depressed with the right turn signal engaged, the blinking stops altogether. All the lights go solid - front right, rear right, and rear left.

Any ideas?

Also, where can I find a wiring diagram for the 1994 dodge ram 1500?

 

Service manuals incl. wiring diagrams are here.

 

I would make you have the correct bulbs and they could also be in the incorrect sockets. It sound like you are getting some feed back thru the wires. Its not uncommon to have bad sockets.

 

A quick flash means there is more resistance that normal, I would check the grounds. Incorrect bulbs can also do this.