I had problems with the engine starting in park and neutral. I replaced the NSS with an NOS switch (after trying 2 after market units). I also replaced the wiring harness to the NSS. I checked for power at the firewall, with the car in reverse and the engine on. There's no power at the firewall. The fuse is good. I checked the harness. There's continuity on the wire that goes to the NSS when the trans in reverse and no continuity when in other gears. Is there supposed to be power at all times at the firewall for the reverse lights and the care is in reverse when the power is on?