1998 GMC Sonoma won't start click sound. lights come on but not starting.

What do you mean ,won't make a sound ? Is it a no crank - no start ? Turning the key to start what happens ,does the starter engage an spin the engine ?

Car Won Start Copyright AA1CarYOU TRY TO START YOUR CAR BUT IT WON...

Cpuld be bad ignition wires, plugs. Dirty air filter. Plugged up fuel filter. Message me if intrested and I'll tell you how to check.the codes yourself using a paperclip.

Check your switch that runs to your aternator.make sure is grounded .if not get a sand paper and sand it down.also check the switch that plugs in to the alternator.

Your Battery is Corroded or Bad.... Pull your Battery, Clean the Terminals, Charge your Battery and have it tested and if it is bad, replace it. If it is Good, then Clean the Terminals and the Post REALLY GOOD and reinstall and your problem will go away. If your Battery is Good, test your Alternator. Your Battery should have 12.6-12.8 Volts. When it is Running, it should be 13.4-14.6 Volts Depending on your Alternator and Voltage Regulator

Is it just one headlight that won't come on or both?

check battery volts should be 12.6 volts battery either weak,or battery cables could be loose or battery cables and post has corrossion clean corrossion from both cables and post using small steel brush clean battery post with.first turn off radio before disconnecting negative battery cable.

check fuel pressure, I have had a similar issue and it turns out it did not have enough fuel pressure to start it on its own.

Check the fuel pressure regulator. Pull the vac line after it is warm and see if it is leaking gas into the vac line.

The 99 GMC, when it acts up, check whether it has fuel and/or spark. It could be related to fuel pressure, available electrical power, ignition component/s.