If you've got a reading of 1.5 volts you have way too much voltage drop. It should be more like .2 volts. You've got too much resistance somewhere in the line. Check connections through your ignition switch, firewall etc.
Yup. Your no 1 suspect is the bulkhead connector, but you'll have to check the entire path.
Your basic circuit path is from the battery -- fuse link -- bulkhead -- ignition switch connector -- through the switch -- back out ignition switch connector -- back out bulkhead.
So check each point carefully to ground. You'll have to check both sides of the bulkhead to find that, or just pull it apart and look it over.
