Blinkers dim when headlights are on

[idus25]

Hey All,
Have two issues:

1. Blinkers are dim at best when headlights are powered on. Bright when headlights are off.
2. Drivers taillight is not a bright as the pass

I have installed a Painless Harness w/Viperwolf headlight relay upgrade. Cant for the life of me figure. I searched the forum and found a thread from 2010, but still have not figured. Got to be something simple I am overlooking.

Any help would be greatly appreciated.

Thanks.

 

[bax]

It may need fluid. Of Check your grounds to the lights. Alternator in good shape?

 

[idus25]

It may need fluid. Of Check your grounds to the lights. Alternator in good shape?

Fluids topped off. Alternator in powering. Battery on charger now. Double checking grounds now. IF I had a bad ground would the light not light? Double filament???

 

[Broncobowsher]

Do you have early wiring or late wiring? That is do the park lights go off with the headlights on (early) or do the park lights stay on with headlights (late).

I'm thinking there is a grounding issue and maybe some backfeeding as well.
Doubt the headlight relays have anything to do with it. Unplug the relays (don't touch any other wiring) and see if it is still the same? I suspect a bad ground and backfeeding through the park lights (not headlights).

Electrical work is hard enough when you are working on it in front of you. Trying to figure out what is going on via remote control, on a modified system, that can be nearly impossible.

When I have two systems that are interacting with each other (headlights and turn signals) most of the time you will find the problem where the two systems cross paths. In this case it is generally the brake and turn signal bulbs. They have separate feeds, but share a common ground.

 

[Viperwolf1]

You could have poor grounds at the front and the lights would sort of work.

 

[bronconut73]

Two biggest culprits are

Poor grounds
And
Blinker fluid.

But I'm going with poor grounds.
Start at your fire wall and as you go forward improve every ground you find.
I did this years ago (the 80's) and even added a few grounds. It has likely saved me many of the issues I hear about here regarding electrical issues that come back to poor grounds.

 

[bax]

He did say his fluid was topped off so has to be grounds.

 

[spap]

If your going to check the blinker fluid you should check the muffler bearing too.

 

[SHX669]

When I did my Painless the wiring for the 'blinkers/park lights was backward. Parklights on was the brightest and turn signal was the dimmest - backwards. Talking to another EB owner his 'blinkers " were also backward but he had a Centech harness so musta been a factory thing.
I didn't notice mine untill i took the signal lenses off and notced both bulbs were black and and pretty warm.
Easy fix - i just cut the wires at the signal and swapped with a butt splice.

 

[idus25]

Thanks for all the help with grounds, wire switching, fluid level, etc....

After a length diagnosis of grounds throughout the Bronco I found that culprit...

I decided to get cute and install LED replacement bulbs. NO GO on the Parking lights. However, they work well on all four marker lights and the taillights. Once i went back to the original bulbs for the Park lights, all four now blink brilliantly.

Thanks again.

 

[bronconut73]

Yup,.....you need them ohms to blink right....

 

[Crush]

Gotta get that new blinker module for led lights. It replaces the stick one and you can run them

 

[bronkenn]

And top off that blinker fluid