What's wrong with my truck? - 2

I have a 1999 Ford F 250 Super Duty v8 5.4 liter Triton.I'm having electrical issues some clicking in my dash my dash lights are on and off at times the check engine light has been on then goes off at certain times. The air bag light has been on and goes back off random times. When my truck is off my Air stays on unless i turn it to off position… Its been draining my battery what could be the problem. I just had my alternator checked its good my starter is good my battery has just been replaced and it's still happening. Someone please tell me what this might be…

Electrical ground

  • Wrong sparkplug put in truck? I have a 93 ford ranger, for some reason thought it was a 97. Put sparkplugs in for a 97, not sure if that's bad or if the sparkplugs for the two years are pretty much the same. Been driving it around fine, just don't wanna do damage to it.
  • What's wrong with the truck? I went for a ride with my grandfather yesterday. He told me to drive on the way back. I've driven this truck a lot so I know how it feels and drives. The first thing I noticed was that the steering was loose and shaky feeling (wheel moves with bumps). It's usually tight and very responsive. I also noticed the brake pedal felt kind of squishy instead of firm. What's wrong with this truck? It's a 2000 Ford Ranger 4WD.
  • What do you think is wrong with my truck? I've a 2000 Ford Ranger and today for the first time it gave me trouble starting up. I had to crank it like three times before it actually started. The check engine light is on but I put coolant(and water) in it yesterday so it's not the coolant
  • What do i need to make my truck an off road truck? I have a 2998 ford ranger. 4.0/ manual. What do i need to make my truck a good off roading pre runner? (Suspension, light, fenders)