Radio sound popping and crackling, at first I thought it is problem with radio now suspect something else, sometimes when starting heard a electrical pop sound, now car goes into overdrive and O/D light flashes. Car manual states this is an electrical problem
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Re: O/D light flashes
When that light flashes there is a dtc stored.. itflashes to let you know an error occurred with the transmission.. could be as easy as low fluid level..it needs to be scanned for codes to be properly diagnosed
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Well, you're dealing with a short. If the right turn signal only works the right side bulbs, you know you're issue must be in the switch. The only way left turn signal would light the right side, but the right signal would not light the left is if you added a diode, which I doubt is the case. So the switch itself is suspect. That or a wiring issue. If you just bought the truck, and this is an existing issue I'd suspect wiring. If it just started doing this I'd suspect the switch.
I would check to make sure someone didn't monkey with the wires and switch the left turn signal with the hazard lights or something (do your hazard lights happen to flash only the left turn signals?). If it has or had an aftermarket alarm you need to check their work and see what may be screwed up. Alarm systems often tap into the parking lights, which will look like all 4 turn signals, but are actually dimmer filaments. Flashing the parking lights would actually make your radio flash too, so I'm kind of leaning this way. Can't say for sure on limited information though.
in radio mode, A./m and F/m
and what about other modes. Cassette, CDDA disc? all crackle
if only radio, then connect a test antenna to the radio
if not the radio is bad, or DC power to the radio is bad.
cuts out, does that mean, just the sound dies in all modes. (left and right speakers)
or the sound and even the dial lights and station tune data is dead too.
when you lose the cluster and radio and temperature control and headlights, I would suspect a short in the wiring harness. If you hear a crackling sound and smell burning plastic this could be the issue. This is not my forte, but I have seen this before in trailblazers and bravada models.
First Visually check all your fuses. Does rig have amp for stereo by any chance? It sounds like amp is bad and/or fuse is blown. Amp is wired between radio and speakers, and a shorted amp would make crackling in speakers when radio is OFF
Are your speakers factory? Sometimes the wires start corroding from moistures or from not being covered well. If you can or know someone who can, you may try checking the wires to the speakers/radio. If they are corroding, they may be shorting out.
I had the same problem, the main plug in the back of the radio does not seat correctly, you have to buy the radio removal tools which are four "keys" you pop into the four corner slots of the radio, pull out the radio, unclip the main wire plug and re-clip it in... it'll work fine, however, its happened to me about 3 times in the 6 years I've owned the car, so keep those keys handy. Oh, and don't believe any dealer that'll tell you different, my dealer told me I needed a new $500 radio, and the radio removal tools were like $300.... I got them for like $20 on ebay.