* Under the dash: Many GMC Sierras from this era have the turn signal relay located in a fuse block or relay center under the dashboard, often on the driver's side. You'll likely need to remove a panel or access cover to get to it. The fuse box usually has a diagram showing the relay locations.
* Under the hood: Less common for the turn signal relay specifically, but some components might be in the under-hood fuse box/relay center.
To find it:
1. Consult your owner's manual: This is the best place to start. It should have a diagram showing the location of all fuses and relays.
2. Check the under-dash fuse box: Carefully examine the fuse box and any relay centers you find there. Look for a relay that's labeled "turn signal," "flashers," or something similar. Many times the labels are directly on the relay itself.
3. Check the under-hood fuse box (if you haven't already): If you don't find it under the dash, check the under-hood fuse box. Again, look for a labeling that indicates a turn signal function.
4. Use a wiring diagram: If you can't locate it visually, a wiring diagram specific to your 1996 GMC Sierra 1500 will be extremely helpful. These are often available online through automotive parts websites or repair manuals. You can trace the wiring from the turn signal stalk to identify the relay.
Remember to disconnect the negative battery cable before working with any electrical components to prevent accidental shorts or damage.
