Bulb with double contact for applications where positive is always on the bulb and ground is switched to activate the bulb.
Found on Mopars:
-Dome Light
-Trunk Light
-under Hood Light
1962-73 Mopars and others
#1004 MINIATURE BULB BA15D BASE - 12.8 Volt 1.0 Amp 12.8 Watt B-6 Double Contact Bayonet (BA15d) Base, 12.0 MSCP C-6 Filament Design. 500 Average Rated Hours, 1.75in. Maximum Overall Length.
Power Path