97 gmc k1500 electrical problem...gauges

SOURCE: 1997 chevy k1500 transmission

it should be the 4l60e , i believe the c-series were the heavy duty models with the larger rear axle and the 4l80e tranny. but to be certain , it's stamped on the passenger side i believe , towards the front (on the bell-housing or right behind on the gear box but definately on the pass. side. note: you may have to remove the heat shield in order to see it . it's that little cover ( held by 2 small 10mm bolts ) that reflect the heat from the catylitic convertor but its simple...

SOURCE: fuel gauge stuck on half full

I can tell you almost for certain your fuel level sending unit is bad, I have been able to fix them though. It requires removing the gas tank and then the fuel pump. You can if your inclined, bend the brushes on the small circuit board over more so they will make better contact on to it. Other wise its a new fuel pump assembly, check all plugs and wiring by unpluging and repluging them to insure no bad connect. It is possible it could be the guage itself, but in thirty years of fixing cars never had a bad guage

SOURCE: I have a 1996 k1500. How do you reset the air bag

unfortunately it will need to be taken back to the dealership as only they can reset Airbag lights.

SOURCE: what is the code and where do I find it for a 1999 K1500 4x4

what code ?? for what if it is for radio then for the 99 chevy just turn on ignition and then press buttons 2 & 3 together write down three digit code. then press am/fm and write next three digits and give me the six digit code and I can then get you your 4 digit unlock code. the tow haul button on the shift selector I am guessing isn't working??? this is common and you will find a broken wire in the column right at the bottom of the shifter arm.

SOURCE: 1998 k1500 5.7l 105a alternator. replaced

At idle the alt shows 12.5 ?
How about at 2000 RPM....does the voltage rise with increased engine speed?
If no increase in voltage with higher RPM........the alternator may be defective.
Remember....if battery is low and you add the load of all accessories the voltage may be low at idle speed until the battery is charged up.....this would be normal under this condition. Once the battery is charged the alt can handle the load of the accessories at idle and should be able to keep voltage up.
Also......a defective battery could be taking all the alt has got to give.....resulting in a low voltage reading.
We would like to see approx 14.5 volts when vehicle is running.