To find the relevant fuse(s), you need to know which sending unit is malfunctioning (fuel gauge, temperature gauge, etc.). Then:
1. Consult your owner's manual: This is the best resource. It will have a fuse box diagram showing which fuse protects which circuit.
2. Locate the fuse boxes: The Grand Am typically has at least one fuse box under the hood and another inside the vehicle, usually under the dashboard.
3. Check the fuses: Carefully examine the fuses visually for any that are blown (burned out or broken filament). Use a test light or multimeter to confirm if you're unsure.
Without knowing which sending unit is failing, I cannot tell you which fuse to check. For example:
* Fuel Level Sending Unit: This would likely be related to the fuel gauge. The fuse protecting the gauge circuit should be checked.
* Temperature Sending Unit: This would affect the temperature gauge. Again, the relevant gauge circuit fuse needs checking.
If you've checked all relevant fuses and they're good, the problem likely lies within the wiring, the sending unit itself, or the gauge cluster. You'll need further diagnosis at that point.