Strange Blinker issue

[Havocatl]

So I have a 70RR, and my passenger side blinker is having this strange issue.

When the parking lights are on, the passenger running/blinker light does not light up. I have tested with a voltage meter and i'm getting 11.45 volts. I have changed the bulb with a known working bulb from the drivers side, and a brand new bulb.

Here is where it gets really strange. If the parking lights/head lights are off, the passenger blinker works, however it seems like it blinks slower than the drivers side. With the parking lights/head lights on, the blinker does not work and I get a solid green light in the interior for the passenger side blinker.

I find it really strange when the parking lights/head lights are on, the bulb does not light up as a running light, nor does it blink when the turn signal switch is on for that side, yet it works as a blinker when the headlights/parking lights are off.

Any idea's what this could be? I swapped the side marker light plug with the parking light bulb plug, and then I can get the bulb to come on when flipping the headlight/parking light switch... so it seems maybe there might be an issue with the connection going into the parking light plug... but I am getting voltage with the correct setup when testing with my voltmeter so this has me scratching my head.

Any help would be appreciated!

Thanks!

 

[Car Nut]

aboard!

Have you checked your blinker fluid?

 

[dieseldazzle]

Bad ground

 

[Billccm]

I think you have a voltage drop. The clue is slow blinking.
If the park lights are bright, then the ground at the socket is good.
Back probe the connection of the harness to the bulb. Compare voltage with and without the bulb. If the voltage is comparable, then I would suspect the sockets contact.
Get a can of DeOxIt. Spray the socket and let it soak awhile. Then work backwards spraying each connection at the connector.
I just fought the same problem with my road runner. It was a bent connection inside a connector.
Good luck.

 

[hunt2elk]

I would guess a bad ground in the lamp assembly that is not working correctly.

 

[oldbee]

First thing to always check is a bad ground!! Make yourself a 4-5' test wire with alligator clamps on each end and you can use it in a lot of places, because you'll need it in the future.

 

[Havocatl]

This is so weird. I took apart the entire passenger side grill/headlights and pulled back a lot of the wire wrapping... I can now literally move the passenger side wiring over to the drivers side and plug it into the drivers side running/blinker light housing and it powers the bulb. When I move the passenger side bulb housing and plug the drivers side power to it, it will not turn on. So I'm guessing the housing is bad, even though it lights up the bulb when I plug in the side marker (Yellow) connection? I have cleaned all the connections...

 

[oldbee]

Corroded connections? Bad ground between light socket&light housing? ALWAYS think bad ground first in your diagnosis. By the way, you guys over the worst of the rain down there?

 

[Havocatl]

Yeah we got a TON of rain but Saturday and Sunday have been nice!! I've fixed quite a few issues with my RR over the weekend

 

[Daves69]

Just throwing this in.
Maybe the disc has spun inside the socket. Do the socket terminals line up with the bulb terminals when locked in?

 

[moes]

Just a tip, when you finally figure out your electrical problems.
Dielectric grease is your friend. Put some dielectric grease in the bulb sockets and on your plugin wire connections, it will stop the moisture from creating corrision. Corrsion causes the wires to heat up and then you get corrsion. I put it on all electrical connections, bulb sockets and spark plug wires.

 

[RGC440]

Some older flashers (non HD) would not flash if either bulb was burned out. Have you checked the rear bulb?

 

[hunt2elk]

The socket that the bulb goes in is grounded through a crimped flange to the housing. I had an issue with one on my Charger and it sounds like yours is doing the same thing.

 

[Yatzee]

So I have a 70RR, and my passenger side blinker is having this strange issue.

When the parking lights are on, the passenger running/blinker light does not light up. I have tested with a voltage meter and i'm getting 11.45 volts. I have changed the bulb with a known working bulb from the drivers side, and a brand new bulb.

Here is where it gets really strange. If the parking lights/head lights are off, the passenger blinker works, however it seems like it blinks slower than the drivers side. With the parking lights/head lights on, the blinker does not work and I get a solid green light in the interior for the passenger side blinker.

I find it really strange when the parking lights/head lights are on, the bulb does not light up as a running light, nor does it blink when the turn signal switch is on for that side, yet it works as a blinker when the headlights/parking lights are off.

Any idea's what this could be? I swapped the side marker light plug with the parking light bulb plug, and then I can get the bulb to come on when flipping the headlight/parking light switch... so it seems maybe there might be an issue with the connection going into the parking light plug... but I am getting voltage with the correct setup when testing with my voltmeter so this has me scratching my head.

Any help would be appreciated!

Thanks!

It's strange that you should bring this up, I just delt with it three weeks ago. Seems there's light switches and then light switches. Some switches only illuminate the parking lights with the head lights off and somewhere in time the older switches were revamped so you can't drive with parking lights only and still have signals. Seems strange because the bulbs are dual filament so you would think one filament does park lights and the other signals. The signal filament is quite a bit brighter. If you look at an OE wiring diagram there does not appear to be separate circuits for both functions. Use the color coding and trace the wiring and you'll see what I mean. This anomoly originates at the light switch itself and I suspect when the contact for head lights is made, the contacts for parking lights drops out.

 

[Qbrozen]

I had a similar weird issue with one of my lights. After playing around with it for the umpteenth time, it magically started working. I did not realize the housing itself grounds through the body. So I'm pretty sure it was dirt/rust preventing that clean connection and simply removing and reattaching a number of times cleaned it. Not sure if your '70 RR works the same as my '67 Coronet.

 

[The Rebel]

I had a similar issue with my front fender light as it was burned out. When I put a new bulb in the housing it did not light up. When I played with the wires it came on but quickly filled with a cloudy grey smoke. Put in another new bulb and it was working fine, so put everything back together & the bulb went out until I replaced the housing back into the fender with the nut locked in.

Correct me if I'm wrong but the fender lights do not blink in a 68 Charger, correct?

I had a similar weird issue with one of my lights. After playing around with it for the umpteenth time, it magically started working. I did not realize the housing itself grounds through the body. So I'm pretty sure it was dirt/rust preventing that clean connection and simply removing and reattaching a number of times cleaned it. Not sure if your '70 RR works the same as my '67 Coronet.

 

[oldbee]

Rebel- fender markers nope. But 68 park lites in frt were not on with hdlights, that happened a couple years later.

 

[beanhead]

It's strange that you should bring this up, I just delt with it three weeks ago. Seems there's light switches and then light switches. Some switches only illuminate the parking lights with the head lights off and somewhere in time the older switches were revamped so you can't drive with parking lights only and still have signals. Seems strange because the bulbs are dual filament so you would think one filament does park lights and the other signals. The signal filament is quite a bit brighter. If you look at an OE wiring diagram there does not appear to be separate circuits for both functions. Use the color coding and trace the wiring and you'll see what I mean. This anomoly originates at the light switch itself and I suspect when the contact for head lights is made, the contacts for parking lights drops out.

That's how my 68 is...I finally figured out the parking lights in the front bumper turn off when the headlights turn on..