Is this issue only happening on diesel trucks? I also have a diesel truck. I'm trying to figure out when and why this is only happening intermittently when it's cold. I have noticed that it does it when it's around 40* or below. I also have noticed it only does it when the unit shuts off when I start the truck after waiting for the glowplug light to go off. However, I also have noticed that the unit doesn't shut off everytime when I start the truck. Anyone know why this would be?
Example:
This morning is was 31* when I went out to start the truck. I turned the key on, waited for the glowplug light to go off (which is only a second or two), then started the truck. The radio did not turn off when I started the truck.
Yesterday, the temp. was about the same. Did the same thing to start the truck. When I actually started the truck, the radio shut off then turned back on.
I believe the issue lies with the radio shutting off when the truck is started. If you have ever tried to turn on, say, a high pressure sodium bulb it too will not come back on for a while if it's immediately turned off after being lit.