Turn Signal Directional problem

[72-CLASSIC_RIDE]

Okay, got into the car the other day and drove it.  Found that when I turn on the Headlight Switch to Park Lights, when signaling Left the arrow lights on the right indicator and visa versa on the Right to the left indicator & Instrument lights dim also if I turn all the way for Interior Lighting.  Not dark enough to tell if dimming occurs while increasing Dash Lighting or just if Interior lighting is on.  But, if I dim down Instrument lighting all the way, that turn signal indicator shifts back to correct Indicator.  This is what I know!

All lighting on exterior performs as it should (Brakes, Turn Signals, Park Lights) & hadn't tried the Headlights for any dimming but do come on as expected.  While the interior turn signals indicate incorrectly, the exterior turn signals work on their correct sides?

I hadn't performed any maintenance so not sure what occurred.  It appears to be a Ground Problem and Only occurs when the Park Lights are activated.  I believe the only ground for Instrumentation lights is the one Ground attached to the back side of the headlight switch?  I believe there are (4) places on the Ribbon for grounds but not for the Dash Lights.

Any thoughts? 

Doug  

[Jason]

yuk, ground issues are no fun.  I'd check the bulbs (including side-markers) for loose bulb to socket connections and dim/blackened bulbs.  Also cycle the four-way flasher a couple of times in case it got bumped. 

[72-CLASSIC_RIDE]

3 hours ago, Jason said:

yuk, ground issues are no fun.  I'd check the bulbs (including side-markers) for loose bulb to socket connections and dim/blackened bulbs.  Also cycle the four-way flasher a couple of times in case it got bumped. 

 Am going to play with it some tomorrow and will attempt what you suggested and this time I will try to be more observant.  Thanx for the suggestion Jason......

I know this issue has been tossed around every few months or so but didn't find a similar problem while searching.  I had followed this issue in past submissions but when you get past 70, the memory tends to follow a different path....

Doug