Mazda Repair Questions? Ask Mechanics for Answers ASAP
If the momentary power wire is not receiving a signal when the key is in the start position you have a few options to check that are quick and easy. The most likely cause is a failed clutch safety switch(assuming it is a manual and since you're experiencing this issue, it probably is a manual). Another great bet would be to test the continuity of the momentary power lead using a millimeter. If it isn't one of those, you most likely have a failed ignition switch. Hopefully that isn't the case. Good Luck!
Cool! Same difference. Automatics have a natural safety switch that performs the same function as the clutch safety switch. It will prevent the starter from getting power while the car is I drive and can easily fail, killing the starter's power.
Considering the engine swap, I'd say the odds are also pretty good that the wire was damaged during removal or instillation. I would carefully check the wires, connectors, and pins on the engine and transmission. If everything checks out visually, test the continuity of the momentary power wire.
Sounds like we're getting warmer! Sure man, anytime. Gest of luck!