Erratic continuity

[zoidberg]

I'm trying to check the serviceability of two Battery Selector/Isolator switches - rotary ones.

The Perko 8501 makes the right noises when the switch is rotated through the options, and 'continuity tested' with a multimeter. The Plastimo one doesn't.

I've unfastened the back and cleaned/burnished the contactors to bright metal, and re-assembled. Same odd ( to me ) set of results - continuity when there shouldn't be, and none when there should.

I've tried refastening the central rear part in each of the 4 possible orientations, with similar but not identical results. And I'm more than a little confused.

Could someone with access to a known-good Plastimo rotary switch kindly advise where the 2 Field connections should be, oriented in respect of the cut-out slot, in 'clock-code'?

 

[GrahamM376]

If the switch is not "clicking" as you rotate it, have the ball bearing and spring gone walkabout?

Where is the continuity problem, with the main battery contacts or the Field micro switch? IIRC the Field switch only contacts in the switch "off" position, to protect the alternator.

 

[zoidberg]

I'm trying to eliminate, and one possibility is re-assembly wrong way round. There are four possible ways to refit the screwed-on rear plate. The control switch/knob clicks into place. The internal contactors make and break wrongly - at least according to my multimeter 'continuity' buzzer.

I'm trying to determine if it's a 're-assembly wrong' issue or something broked/wored-out - or to put it technically, 'stuffed'......

And I don't know how I managed to duplicate this question. The software is supposed to prevent that - as is my ever-vigilant memory.