* Under the hood in the fuse box: Many S10s have a fuse box under the hood, often near the battery. This fuse box will contain several relays. The headlight relay is often a larger relay, and you might find a diagram on the inside of the fuse box cover identifying the relays.
* Inside the cab, under the dash: Some models may have the headlight relay located in a smaller fuse/relay panel inside the cab, usually under the dashboard. This is less common than the under-hood location.
To find it:
1. Consult your owner's manual: This is the best place to start. It should have a diagram of the fuse and relay boxes showing their locations and what each relay controls.
2. Check the under-hood fuse box first: This is the most likely location. Look for a diagram on the inside of the cover. Relays are usually square or rectangular and often have multiple terminals.
3. If not under the hood, look under the dash: If you can't find it under the hood, carefully check for a smaller fuse/relay panel inside the cab.
4. Use a test light or multimeter: If you're still having trouble, you can use a test light or multimeter to test the headlight circuit. This will help you trace the wires and locate the relay.
Without the specific trim level of your S10, it's impossible to give a more precise location. However, the above steps should help you locate it. Remember to always disconnect the negative battery terminal before working on electrical components.
