87 monte carlo SS. So opened door, dome light just shut off. Opened other door, no dome light. No power, nothing. Lights dont work. Car literally acts like it has no battery. Bought new battery, cleaned terminals then put it in. Nothing. Car acts like battery completely removed. Testing, getting juice to starter and alternator. Dome loght worked for second, not sure if because testing. Then shit off when key turned. Nothing. Not a short, disconnected negative and hooked test light go negative wire and touched neg battery terminal - no light. Help! Retested starter area after dome light came on for sec - now green line in pic has power. Confused.Help!