2003 v70 volvo brake light problem.

ST/LP, Fuse 12, 25 Amp - feeds battery positive to brake switch ORN (orange) and out the WHT (white).

Test with a simple automotive incandescent test lamp to ground. Test lamp should light on both sides of the fuse and with contact to the switch ORN and to WHT while brake depressed.

The left and right tail and brake light assemblies have separate fuses. The left side is a 5A fuse #3 in the underhood fuse box. Check that out first

Sounds like you may have a short within the brake light switch itself. I'm not familiar with the vehicle but this electric switch will likely be located under the dash on the brake pedal itself.

Did you check the flasher relay in the fuse box under the dashboard? If you have tail lights and brake lights then I'd be checking the flasher. I'd also check the fuse center under the hood of the car. Sometimes there are fuses for the flashers there also.

http://www.autozone.com/autozone/parts/Duralast-Stoplight-Switch/2001-Volvo-V70/_/N-jetkaZ9cias?itemIdentifier=365252_0_0_

Sometimes the wiring will go bad in the light assembly check all fuses under dash and under hood. sometimes have individual fuses for each tail light. otherwise check wiring.

is the bulb good, is the socket good, I would swap the left and right bulbs. then go from there

The wire may have a break inside its insulation you may have to replace hole wire.

Well, have you checked the fuse? Maybe stick another one (of the same size) in there anyway. If that's ok, then check the stop light switch. It'll be somewhere along the brake pedal linkage/ arm under the dash or under the hood around the linkage or master cylinder. Look around. You can short across the wires temporarily to see if they light up and then you'll know if that's it.

Hello. Check relay RMI5 in REM unit located in left side rear of cargo area. As you look at it it's to the right of the central electrical connector 5th from bottom. Matt