Something is draining my battery, there was a short in the headlight switch... i replaced it now my rear parking lights arent coming on i dont know where to start checking the wires..the fuses are fin
The most methodical way to check for wiring shorts is to start at the fuse box. With the ignition turned off, and the key out of the ignition switch, most circuits should be dead. So, using a volt meter or perhaps even an ammeter, pull out each fuse and test whether current is flowing over the circuit. Expect to see current flowing over the fuse that powers your clock and any receiver for keyless entry / remote locking remotes. You might also see current for one or two other systems that are still on "standby" when the car is powered off. However, you shouldn't see current flowing for circuits that could be on but aren't--think dome lights that turn on when a door is opened, or a cigarette lighter outlet that is still active if you plug something into it.
Checking the fuses in this way will show you the system that's got an unexpected drain. I know you suspect something involving the headlight switch, but you might have shorted an unrelated system when you were installing the switch. That's very hard to tell from a physical inspection.
Once you have identified a circuit with unexpected current drain, check your owner's manual or maybe even in the inside of the fuse box cover to see which systems that fuse covers. Unplugging one component at at a time (i.e., radio and 12v outlet are often on the same fuse; dome light is often on the same fuse with other components, etc.), check to see whether the current drain is the same or different. Eventually, you will identify the component that is causing the problem.
At this point, I would suggest charging your battery, disabling your suspected component if you can, and letting things rest a day. Did this fix the battery drain? If so, you're definitely on the right track. If not, you may have found a lesser problem you didn't even know you had.
This is only a starting point for your troubleshooting, but I hope it gets you pointed in the right direction. Good luck!
Mar 09, 2012 |
1990 Plymouth Grand Voyager