So I got the 144 pulled from the 1962 Ranchero and successfully installed into the 1961. Prior to the swap, the charging system was putting out 14 to 14.5 volts. Yesterday I drove the 61 under it's own power for the first time (yay!) however it is still not highway-safe just yet, and the first thing I need to address is why it quit charging. I transferred the regulator over along with the engine. In the 61, there is evidence that someone was intending to upgrade to a V8 (probably the reason that the entire driveline was missing when I acquired it) however there is no evidence that they had gotten around to tampering with the wiring. While connecting all the wires to the engine in the 61, all of the insulation color codes matched exactly to the ones I had disconnected when removing the engine from the 62. The wiring harnesses appear to be identical between the donor and recipient vehicles. The last step was installing the battery of course, and when I turned the key it fired up immediately. The fuel gauge responds, indicating power to the dash, however no back lighting evident to the dash display. The headlights, taillights, and turn signals all work. The brake lights do not. The red warning lights on the dash should turn on when the key moves to the on position, and should turn off after the engine starts. And the one to warn of insufficient charging should stay red in this case after the engine starts, due to the non-charging status. Neither of the red lights turns on at any point in the process, which may be a bulb issue, or considering that it is multiple bulbs affected then possibly a portion of the dash isn't getting power. So I will need to address the dash lighting eventually, and before I get to that the brake lights will be a bigger priority. However my biggest concern now is to fix the charging issue. If it was charging effectively before I swapped the engine, and zero charging now, what would be the first place I'd look to rule out problems?