Your best bet is to:
1. Consult your owner's manual: This is the most reliable source. It should have a diagram of the fuse and relay boxes.
2. Check the fuse box under the hood: Many Chrysler vehicles of this era have a fuse box under the hood, often near the battery. This box frequently contains relays, including the fuel pump relay. Look for a diagram on the inside of the fuse box lid.
3. Check the fuse box inside the car: Some relays are located inside the passenger compartment fuse box. Again, look for a diagram.
4. Use a wiring diagram: A wiring diagram specific to your 1989 Chrysler New Yorker is your ultimate guide. You can find these online through sites specializing in automotive repair information (often subscription-based) or at a parts store.
Important Note: Before working with any electrical components, disconnect the negative (-) terminal of your battery to avoid short circuits. If you are not comfortable working with car electrical systems, take it to a qualified mechanic.
