GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
Do you have a test light or multi meter to test electrical with?
Let me know so we can continue,thanks Pete.
O.k.,remove the fuel pump relay keeping in mind which direction it is installed.When it is removed you will see four terminals that the relay plugged into.Test the terminals as posted below for the signals indicated and let me know what you come up with so we can continue.
Test one terminal for battery voltage (at or near 12 volts) at all times key on or off
Test one terminal for battery voltage with key switched on the first 2 seconds or when cranking over the engine
Test one terminal for ground at all times key on or off
Let me know what you come up with here when your ready.