how do i install a chrome box

Most of the time, when you get power to coil in start but not in run the ballast resistor is the problem. Sometimes its a bad ignition switch. A member recently found the blue run wire degraded to 1 or 2 unbroken strands at the bulkhead connector. Those kind of faults can show "all good" with a simple test lamp yet there isn't enough current to run things. If you can hot wire it and make it run you'll know the fault is in the cars wiring and not the ignition wiring.