Regulator Lucas RB 108 Ariel NH 350 1958

General electrical problems
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Regulator Lucas RB 108 Ariel NH 350 1958

Postby andreas.voigt » Tue Jun 18, 2013 8:47 pm

Hi guys, I have a problem with the regulator Lucas RB 108: The cut-out closes at a voltage of 6,7 V, I thinks its ok. But it does not open if the voltage is under 6,7V. The cut-out opens only if the generator stops! How can I repair it? Is it possible to get spareparts?
Best regards from Berlin

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Postby admin » Thu Jun 20, 2013 5:30 pm

I don't think that you can get "parts" for the mechanical regulators ?
The replacement regulators are often made in India and sometimes of dubious quality

The usual approach is to replace with an electronic regulator (more efficient, less overhead but a little more fragile in the connections)
You can rip the internals out of your original box and mount the electronic one in and solder it's wires to the internal joints.
That keeps everything original externally.
John Nash

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Postby PeterW » Thu Jun 20, 2013 10:49 pm

Unless the coils have failed - and it sounds like they are ok - you should be able to get it sorted by patient adjustment.
"Electrics for Duffers" on the voc site is great for getting the theory and ... _RB106.pdf
will give you the rest!

Should keep you out of mischief for a while...

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