Turnsignal Problem

[Bruzilla]

My 74 Roadrunner is having turn signal issues. When you turn the right signal on, both dash indicators glow bright, but no flashing. When you turn the left signal on, they still don't flash but the right indicator is bright while the left is dim. Any suggestions?

 

[WileE]

I'd check for a bad bulb or bad/no ground, also check sockets.

 

[theGreenOrange]

Also, have you checked the flasher unit? The little cylinder deal with two spade terminals. Just a thought, I don't know what happens exactly when these go out.

 

[theGreenOrange]

Just curious, what do the hazard lights do? That might help you narrow down the problem.

 

[Bruzilla]

Okay... looks like a ground issue. When I turn on the parking lights, both turn signal indicators light bright, and I have the driver's side tail lights and rear marker illuminating and that's it. The four-way flashers flash the rear lights but not the front. I also have no dash lights. I'm guessing when the aholes stole my stereo they knocked a ground wire off somewhere.

 

[YY1]

Usually, when a bulb is out the dash indicator is solid lit when engaged, but not both.

 

[moparmarks]

Check to make sure that the grounds for the front park lights are good.

 

[Bruzilla]

Good call YY1! I found a busted wire behind the headlights, grounded it, and I have turn signals. I am still not getting a light at the rear-passenger marker, passenger tail lights, and dash lights.

 

[idrivemopar]

For the rear passenger lights, check the ground on the harness for the tail lights, there should be one on the drivers side of the trunk. Also check the two connectors that are between the tail lights and make sure they are not corroded as they ride in an area where they get a lot of dirt and moisture from underneath the car.

 

[Bruzilla]

I found a broken ground wire at the rear, and those connectors looked pretty funky. I reconnected the ground and replaced the connectors. I now have all the rear lights working, which of course pissed off the front ones and now I have the front-driver's side marker out and the passenger front parking/turn signal light out.

 

[theGreenOrange]

The passenger side marker gets power from the passenger park light and grounds to the body. Check these three connections (both ends of power wire from park to marker, and marker ground).

The driver park light and directional light are powered seperately from the bulkhead and share a ground to the body. Since these power the drivers marker light the bulkhead is feeding power. Check the connections at the directional and parking bulbs and their common ground.

It is probably the ground for both sides.

 

[Nacho-RT74]

There is just 2 ground wires/provision for the lighting system.

Front one at a side of the batt on radiator core support

rear one on trunk panel, at the side reinforcement.

however:
top fender blinkers are body grounded.

Parking lights mounted on valences uses to be also body grounded

Pot metal tail light hosuings are ALSO body grounded, of course not the plastics ones

a failure on any of these body grounds will make to dim the rest of turning/parking lights side affected by this bad body ground. Including brakes if rear of course

 

[theGreenOrange]

Ok thanks for clarifying, the wiring diagram info is lacking in detail on the grounds.