Subary legacy B4 Auto Need wiring diagram Rear light problems

You have a broken, cut / chaffed wire shorting to ground. The Bantam is specific to Australia, and we are in North America.

You need a good auto electrician who can read factory wiring diagrams and trace faults.

https://www.google.com/search?q=auto+electrician+near+me

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Maybe the wiring diagram will help?

Sounds like the previous owner patched a hot wire to the rear lights instead of fixing the problem.
Someone will need to get the factory wiring diagrams and start backtracking from the lights to the dash to find out what is wrong. You may need a shop manual to get the diagrams you will need. Most repair books do not go into wiring that deep for the DIY.

when that happens your alternator going bad

Auto parts stores have manuals made explicitly for your make and model. It will have the diagram with the color code for all the wires you need.

Check the bulbs, if they are OK you may have a faulty brake light switch.

your power starts at the brake light fuse,check with a test light,then proceed to stop light switch on brake pedal under dash,one wire will be hot when when you check it with your test light, the other won't be until you press down the brake pedal then the power flows through to the second wire,if no power to second wire replace switch,if you have power remove tail light bulbs and check for power in side socket.

more than likely it will be a faulted brake light switch...located on your brake pedal itself.....closer towards the firewall.. easiest to buy a chiltons manual...or possibly ask your neighborhood auto repair shop for the wiring schematic for your brake light switch.....hope I helped!!!

same bulb but 2 seperate elements. wiring diagram u should be able to obtain from your local auto parts store like autozone(preferred)

You have a bad ground somwhere. You need to check and look for broken wires or corroded connections. A good manual with a wiring diagram helps with this.