[Jimradio]

On the Zenith H845, need to replace the power cord to a polarizes cord. The switch goes to ground or the chassis (hot chassis), should the hot lead go to the switch or the neutral lead.    

[radiorich]

Hello Jimradio,
in the real world, yes, the narrow blade on the polarized cord would go to the switch. However, you’d need to rewire the switch so that the wire leading to the diode is connected to the switch instead of the chassis, as otherwise the chassis could become hot.
So the wide prong on the plug would go to the chassis instead .
Sincerely Richard

[Jimradio]

Thanks Richard for your reply, I have rewired some Hallicrafters with a hot chassis. I could do the same with this radio, didn't think about that until I read your comments. On some Hallicrafters I put an isolated transformer in the radio, worked great. The orignal cord on this Zenith is not frayed or cracked just really stiff.
Have to think about this, may add a fuse as well.
Thanks again.

[Jimradio]

If it were to be done with the hot lead (narrow pin) going to the diode (replaced the selenium rectifier) and the neutral lead going to the chassis, that would eliminate C43, R42 the C44 could stay or not. Am I right in thinking this.
Or leave it as the factory did it with the interlock on the back, and the factory cord, non-polarized.
Thanks

[Jimradio]

Disregard my last post, going to leave the cord issue as is from the factory. This radio is wood and plastic with plastic knobs and an interlock back. Should be fine. Can not get into the radio without removing the back thus unplugging from power.