electrical issues - 03 Escalade Base model

[lawrence]

ok so im new here im not a mechanic or nothing im just tryin to get a rough ideal if its the BCM or the Ground or battery wire. here is my issues

Rearview mirror Temp/Compass stoped working. before this happend it was going to like weird symbols and flickering.

door interior bottom door lights not working.
my Dash Cluster Lights Also most of the time dont light up but the gages work. only the {PRND12) et lights up and the Display Reader {Dummy reader thing} like for menu etc.
when i start the car it will not dim on the interior lights, gages, heat control etc and head lights, but when i hit the gas pedal . it will dim in out in out and keep repeating this. every now and then the dash lights will come on.

replaced alt, battery was tested good, dimmer switch does work and function just fine.

 

[Tonyrodz]

With the mirror it's probably the solder , probably needs to be reflowed. I'm surprised the prndl display works. This solder joints usually needs to be reflowed too , mine doesn't even show on my 03.

 

[lawrence]

well i fixed the mirror .. im a dumb ass. i had the power off but it does seem to give weird symbols and cuts off from time to time. the lights i got working with a blown fuse. but i get dimming on all the lights in the vehicle and outside when the vehicle is running only. not when its just on battery mode. new alt. new bat ,and just had both tested today with all good results on em. so bad ground? where to start looking