Any help would be greatly appreciated

[HurricaneSSeason]

I know this is a suv forum, but my other ride is a 99 extended cab silverado. I'm at wits end w this thing! 1st my fog lights stopped working and then all wiper speeds except high. Then my headlights wouldn't turn off even when the truck was off. So I changed bcm's to a 2001 bcm witch gave me the ability to turn the headlights off manually. Also replaced the wiper pulse motor wich didn't help the wiper issue. My amp stopped working 1 day and at some point so did my taillights. Now my turn signals and brake lights work fine just no tails. Do you guys think this is all related? Maybe a ground issue?

 

[wjburken]

I know this is a suv forum, but my other ride is a 99 extended cab silverado. I'm at wits end w this thing! 1st my fog lights stopped working and then all wiper speeds except high. Then my headlights wouldn't turn off even when the truck was off. So I changed bcm's to a 2001 bcm witch gave me the ability to turn the headlights off manually. Also replaced the wiper pulse motor wich didn't help the wiper issue. My amp stopped working 1 day and at some point so did my taillights. Now my turn signals and brake lights work fine just no tails. Do you guys think this is all related? Maybe a ground issue?

I would do an absolutely thorough inspection of your power and ground cables.

I would also look at the fuse block under the hood to make sure there is no funky corrosion in, on, or under it.

 

[Matthew Jeschke]

Electrical issues. I empathize. My 1999 corvette is absolutely cherry but has demos in it now ug.

I second starting with ground points. They're easy to access on this truck.

 

[S33k3r]

Check the positive between the alternator and the fuse block. It is "protected", which means when water seeps into it, it stays there, corroding the cable.