Hi, since I bought my sierra it's had an intermittent problem with the fuel guage, graphic display thing to show when doors are open etc and the radio getting alot of interference. These all seem to be linked and I wondered if anyone has had any similar problems or is familiar with the sierra wiring and could point me in the right direction to start with!

Sometimes the fuel guage will read correctly and the radio will get a good reception on fm and the car graphic thing on the dash will work normally. At random times the fuel guage will drop off right to the bottom below the red, at the same time different doors will flash on and off on the display. Iv also noticed when this happens the radio reception is very bad too. It also seems to trigger this fault when you turn the radio up loud! It used to only do this now and then but now does it nearly all the time. Iv tried a different set off clocks to illuminate the actual guage but made no difference. I presume it will be a bad connection or bad earth sumwhere but wondered if anyone has had a strange problem like this before or has any ideas of where to start!

Thanx for any help.

Ed