Geounds
 

Hi, was wondering why one of my negative wires is grounded to the battery tray? Plus, does anyoneknow where the body ground is on an 02 Sunfire? TIA

Sounds normal — the battery tray is often used as the chassis connection, so a negative lead bolted there is fine if the tray is solidly grounded to the car. On a 2002 Sunfire the main body ground is usually a braided strap or a bolt https://tropical-casino.com/ on the inner fender/firewall area near the battery or radiator support; there’s also a heavy lead to the engine block. To be sure, disconnect the battery, follow the negative cable to see where it ties in, or use a multimeter to check continuity between the negative post and the chassis. Clean paint/corrosion, tighten to bare metal, and use a star washer or proper strap if you add/replace a ground.