Electrical problem for 98 chevy cav

sounds like you have a bad ground some where..trace the wire from lighter back to see if wire is cracked or touching any metal

sounds like you have a dead battery.

Sounds like bad battery cables and/or ignition switch. I would clean battery cables thoroughly with wire brush especially the bottom end since they're exposed to road grime, etc... Also check to make sure you put small wires on solenoid on correctly. I've seen people get them reversed because they're looking at them upside down when attaching from under car. More than likely it's those small wires on solenoid.

Try below the steering column under the dash area.
1996-00 Vehicles Fig. 3: Turn/hazard flasher location - 1996-00 vehicles
The turn and hazard flashers are integrated into one flasher on these models. The flasher is located on a bracket above the brake pedal. Replace the flasher by unplugging the old one, removing it from the bracket, and plugging in the new one.

replace the engines oil pressure sending unit for the switch primes the pump with its circuit upon starting the engine

jack up thecar and put it on stands, disconnect the battery the starter is behind the radiator on the rear of the engine, remove the two bolts that hold the starter on, then lower carefully not to pull the wires apart, disconnect the signal wire firle the the main, just reverse to install

i have a 98 cav with the same problem, it's not really worth fixing if you know how much it is off by,

I would recommend replacing the in-line fuel filter

Unplug it, and run a wire to your positive battery post, and another to a good ground, and it should go.

Most chevy cars have 3 wires. I main wire that comes from the battery. Another a little smaller wire that goes to the same post in the center of the starter solinoid. And 1 small wire that goes to the smaller threaded post on the side.