1972 F-250 2wd to 4wd build

Just an FYI: I ordered the Vintage Air kit January 22nd and it hasn't even shipped yet (keeps getting pushed back, supposed to ship April 9th is the latest). Apparently they're short on "raw materials" (in dash louvers to be specific) due to COVID.

I'm pretty sure we are both old and slow, but it's not a race, just have to finish.

Being an Explorer, it came with factory A/C. I had it working before I blew it apart, but it needed a fan motor among other things.

I shielded only the high voltage output drive of the MSD box (coil primary input) to reduce EM emissions specifically for the EFI and digital gauges. I did it preemptively before I started the motor. The MSD box boosts voltage to coil to 500 V and switches it off/on every cylinder fire. The switching of high voltage creates a shitload of noise. The plug wires themselves are shielded. The goal was not to contaminate all of the power distribution circuits that are right between the MSD and coil, as that would inject noise everywhere in the system. So far I have not had any EMI issues.

If the wire was short, shielding could be skipped.

Thanks. I have a mostly complete system, I'll let you know if I need something. Shit is old....

I'm revamping mine too... also had factory A/C. All the components are in good shape really, just need to replace the O-rings and whatnot to make it an R134a system. There will prolly be something else too, but I haven't gotten that far into it yet,

well hopefully they can get it to you before it get too hot. I'm not sure I buy the covid excuse...

Makes sense, thank you for the detailed explanation. Did you ground your shields anywhere?

Yes, I choose to ground the braided shield on the coil end as it was physically easier. Could be either end in this case but shield must be grounded to be effective.