Rear lights not working 97 I30

when my running lights are not on and i press the brake i get very faint brake lights except for the one in my rear window it works fine, when i turn on my light i get now Brake/running lights on the rear of my car except the one in my rear window. my turn signals and revers lights work fine. I have check fuses and bulbs im using 1175. my skill level with vehicle electrical systems is very minimal.

1997 Infinity I30
140,000 miles

when my running lights are not on and i press the brake i get very faint brake lights except for the one in my rear window it works fine, when i turn on my light i get now Brake/running lights on the rear of my car except the one in my rear window. my turn signals and revers lights work fine. I have check fuses and bulbs im using 1175. my skill level with vehicle electrical systems is very minimal.

1997 Infinity I30
140,000 miles

If grounding points have corroded, symptoms match. This helps if problem is gnd: Add a new ground wire, it wont harm --> Open both rear lamp assemblies, solder each assy an extra wire to the common=ground point (doesnt matter where as long as it is common to each bulb). Attach other end(s) under nearby screw. If u desire the connections work later on, use spray contact grease.

Brake +supply wire comes via pedal switch. Measure voltage therere, has to be over 12V. If not, disconnect and rewire supply +12V from/after some fuse to the brk switch. If this wont help, you may also add whole new wire from the switch to both rear brake lights. If u make this, cut off the original (rotten?) wire... Use similar or greater wire thickness.