it immediately blew again, even though everything was off and the key was out of the ignition.
That is a great clue!
If you haven't taken advantage of the color wiring schematic over in the
Articles section, now is the time.
Take a look at the two LH headlamp relays, and you will see that they are the only devices that receive +12vdc from Fuse G.
The fact that the Ignition switch is in the Off position, tells us that the relays are not enabled, thus the circuit from the relays out to the headlamp bulb should (barring a faulty relay), not be active.
- To rule out a faulty relay, remove both LH headlamp relays and try another fuse:
- If the fuse does not fail, this indicates the circuit from the fuse to the relays is probably not the issue.
- Reinstall either of the headlamp relays in one of the empty relay locations.
- If the fuse does not fail, this indicates that neither that relay, or that relay socket (and related circuitry) are probably not the issue.
- Remove the relay, and install the other relay in the same relay socket.
- If the fuse does not fail, this indicates that neither relay is probably at fault.
- The problem has been narrowed down to the remaining LH headlamp circuit:
- Remove the relay, and install it in the other relay socket.
- If the fuse does not fail, this indicates that neither LH headlamp circuit is at fault.
- Reinstall the remaining relay in the remaining relay socket.
- If the fuse fails, then that is surprising, and means tracking down the issue is going to be a bit more tricky.
- Check the installation of the replacement headlamp bulb.
- If the fuse fails in step #1, this indicates the problem is most likely in the wiring from Fuse G to one or the other LH headlamp relay.
Probably the first step is to check the installation of the replacement headlamp bulb, look for damage to the wiring at the connector, look that the spring wire-bale is not shorting one of the conductors.