Radio flashes with turn signal

[AK49BWL]

I guess it could be the alternator starting to fail. Mine still did it when I dropped in my 200A AD244 tho, and it has more than enough juice at idle to keep things going.

 

[HotWheelsBurban]

It does it with nothing else switched on - with or without engine running - and I'm pretty sure it didn't before. The audio warning 'seems' louder also - though I could be imagining that. All that I'd noticed prior to this was the voltmeter fluttering at the point of engine shutdown as its needle dropped back on the scale. That, I've only noticed in the past few weeks but could have been doing it forever.

Truck was in for its annual safety inspection on Tuesday and when I got it back it was doing this. Hard to believe anything in the inspection caused it - but hard to ignore the timing. It did - during the test for no obvious reason - get left sitting idling with headlamps switched on for some 10-15 minutes.

Check the battery terminals, they may be just a little bit loose. Rawhide does this from time to time, so I have to check it periodically.

 

[1500z71]

Your radio and taillights are on separate grounds, but go ahead and ensure they're clean and tight. How do your battery cables look?

If this hasn't already been done then 2x on checking battery cables and connection. I had an issue where my A/C on would balloon my tach and odometer... it was a loose negative on the battery side.

 

[Erin]

No, not entirely! Just noticed it yesterday and maybe it has been doing it all along. Anyone (everyone!) else's truck doing the same thing?

Mine always has.

 

[GoToGuy]

Noting else affects the voltage gauge except the when turn signal functions. I get a small up down movement with turn signal flash. I was going to temporarily install a second volt gauge to do a short term comparison observation. To see if I can remedy it. That's on the 95 K2500. And yeah it drives my ADD/ OCD into the red zone.

 

[68corvair]

My 93 suburbans volt gauge also pulses to the turn signals. Even with an upgraded alternator ( late model 160 AMP Hair Pin ) and not running any other accessories. I have been over the grounds. Occasionally when I turn on my headlights the radio shuts off or looses its station. That I figure is a ground issue but I haven't found it so far

 

[Vic327]

My guess would be a bad ground but you have to tell us what exactly causes this when you find out. It would be a great prank to pull on someone.

 

[Pinger]

Check the battery terminals, they may be just a little bit loose.

Did that, tightened them a smidge, voltmeter still dances to turn signal's tune. Meanwhile, the fuel gauge's needle lies (both senses of the word) like a drunk in the corner.