The almost imperceptible glow ....

On or around Mon, 11 Sep 2006 11:01:05 +0100, "Oily" enlightened us thusly:

yeah, not B+. I've seen them labelled D+ though. I didn't have one to hand to look at.

W is the terminal that outputs AC and can be used for a rev counter.

I've found the details, thanks Derek, I have to do some major rewiring as the loom's in a sorry state so may re-connect the ammeter. Greg

UPDATE: the plan worked :)

The cack-handed alternator is now right-way-round and the 110 is back in business again.

Managed to acquire a set of diddy sockets at Maplin today - so the rectifier unit is now detatched from the original alternator. Brushes look in fine fettle - how do I bench check/verify or is it less hassle to simply go buy a new one?

On or around Sun, 17 Sep 2006 21:13:21 +0100, "William Tasso" enlightened us thusly:

this is the one that had a dim glow on the light when running, isn't it?

I was once told (ISTR by a chap at Lucas) that that was symptomatic of partial diode pack failure. if so, chances are regulator is OK. The rectification is done by a bunch of fat diodes, sort of like a bridge recitifier only diffferent - I think it uses a pair of diodes per field winding or something. The output, of course, is from the field and not the rotor - the box with the brushes controls the rotor (exciter) current which determines the output.

I assume you can test the diodes with a suitable meter. I believe the diode pack is available as a spare part, but I doubt it's worth the effort. ISTR having one done (when there was still a Lucas Service place up in Aber, into which one could walk via the back door, so as to talk with the chap in the workshop who knew what he was doing) - it involves a fat soldering iron, along the way somewhere.

yes - although that died completely by the time the charge meter showed negative

ok - is the diode pack in the same removable unit as the brushes?

Ahh - so nothing apart from the brushes in that unit?

pics of the removed bit - this is where I thought I'd find regulator/rectifier

I could - if I knew where to find them :)

Well - I have a 60W wolf iron from a long while back. Damned n b*ggered if I want to spend £100 on a 'recon' unit if I can fix it with parts.

Meter not required. Bulb, a length of wire and battery will suffice.

heh - I can find the meter (and a selection of bilbs, batteries and wire bits), it's the test points I haven't located.

This is still the A127/45 isn't it?

Test detail is in the 90/110 manual on the Estonian site:

The rotor is the field (well,the winding on it) and the output is from the stator windings. :-)

Martin

- the box with the brushes controls the rotor (exciter) current which

yessir - this is the unit that is now removed from the motor.

brilliant - thanks for the heads-up.

On or around Mon, 18 Sep 2006 14:57:39 +0100, "William Tasso" enlightened us thusly:

that's yer regulator. senses voltage and supplies more or less rotor current to make the thing generate. The rotor current gets in vis the slip rings on the end of the rotor and the brushes on the unit.

On or around Mon, 18 Sep 2006 19:56:15 +0100, "Oily" enlightened us thusly:

bugger. I thought that read wrong. yes, stator of course, you're quite right. 's the opposite of a dynamo.