Radio noise.

[Bob Etter]

'I had much the same problem on an A-65 that I had.

If there is any place where you can physically touch the P-lead, without shielding, it will radiate noise.

I had the leads on the backside of the Mag switch covered with a light weight steel cap that necked down to a diameter only slightly larger than the wire bundle. The shielding braid was electrically bonded to that.

On the Mag end, I used Bendix Shield P/N 10-16140Z on both mags. There is other parts associated with it, and the braid was also terminated into the input end of the shield. I was using a SF4 versus the SF6.

And another reminder. Take a look at the wire that feeds the DC Fuse buss. The OE wiring had an 18 ga. wire. It is a wonder that I, or the previous owners, didn't have a fire. It should be possibly as large as a 6 ga. or as small as a 10 ga., but that would depend on what your load is. Mine will need to be a 6 or as small as a 8 ga. My landing light is 20 amps., all by itself. Don't hold me to the numbers, I haven't ran the numbers to see what my total will be.

Regarding Mag overhaul. Don't let someone do it on the cheap. My old Cub needed a 500hr overhaul of the mags.(After I sold it) They didn't tear it all the way down and lub the shaft that goes into the distributor cylinder. So within a few hours there after the distributor started rattling/vibrating at low RPM. It usually quit once the RPM got above 1000 RPM. They didn't think Mags, because that just overhauled them. Or at least paid for it. So they tore down the back end of the motor only to find nothing. A dab of special grease about the size of a big match head was all that was required. The shaft fits into a brass bushing inside the distributor, and the major load for the distributor is carried on a small ball bearing set on the gear end of the shaft.

(My spell check only works in French, Sorry)
Bob

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