Hello all,

I am brand new to this forum and fairly new to Chevrolet. I have a 1998 Blazer that seem to have the following electrical issues[LIST][*]Temperature and Fuel Gauge Inoperable[*]Low fuel light constantly on[*]Overhead display (temperature,compass, fuel economy, etc) not working[LIST][*]ABS light contiuously lit[*]Check engine light always on[*]no power to 4wd selector

Partial Solution:

I found that pin #13 on the Black connector of the PCM (Brown wire) is only getting 3v when it should be getting full power. I have checked and replaced all fuses and checked all relays but all are functional. If I put 12v of power to the #13 pin then everything (gauge cluster, 4wd, overhead display) works just fine. When I take the 12v power away from the PCM the gauge cluster will continue to operate as long as the vehicle is running, but it defaults back to its inoperable state once it is shut down. The 4WD and gear selector display stops functioning as soon as I take the 12v away.

I am trying to figure out if this is a problem with the PCM or is there some other component that is causing the low voltage to pin #13. I am not finding any indication of an open circuit, but I am not sure if there is a bad ground in a wire or circuit that supports that part of the PCM.

Would it be possible to install a jumper to the brown wire at pin #13 that will provide 12v when needed (when the ignition is in the run position) without damaging the PCM? When I have applied power to it during the diagnostic testing I did not notice any negative effects but the power was only supplied for a few minutes at a time.

I hope that I have provided enough information to get some good initial responses and I thank everyone in advance for their input.