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Replacement for Lucas battery master switch.

PostPosted:Fri Apr 12, 2019 5:01 pm
by Charles Hunt
KATI has developed a battery draw of 0.4 amps even with the master switch off. Whilst cleaning terminals I found a wobbly post on the master switch which I think is a Lucas SSB106.

This may or may not be anything to do with the current draw, but should be corrected anyway.

Should I just purchase a like for like replacement, or is there anything better out there that is an easy fit?

(Away for a week from tomorrow so thanks in advance!!)

Re: Replacement for Lucas battery master switch.

PostPosted:Fri Apr 12, 2019 7:22 pm
by T67M
Are there any electrical loads on the battery hot bus? 0.4A sounds like a map light or similar may not be switched off, or maybe a USB power outlet.

Re: Replacement for Lucas battery master switch.

PostPosted:Fri Apr 12, 2019 7:55 pm
by Charles Hunt
Nothing that complicated in KATI. I’ll go looking for the current draw when I get back in a week.

Re: Replacement for Lucas battery master switch.

PostPosted:Fri Apr 12, 2019 9:04 pm
by cockney steve
Westminster car-breakers at Sherburn -in- Elmet (a couple of miles from the airfield) are specialist Rolls Royce /Bentley (and Mercedes ) breakers. All the Shadows, Spirits and equivalent Bentleys have a battery master-switch in the boot. may be worth an email. (ads on ebay)

Re: Replacement for Lucas battery master switch.

PostPosted:Sat Apr 13, 2019 3:40 pm
by MikeW
That's pretty hefty Charles!

https://www.autoelectricsupplies.co.uk/product_list/30
have that switch at £43.71 https://www.autoelectricsupplies.co.uk/ ... ategory/30
or a copy of it at £14.77 https://www.autoelectricsupplies.co.uk/ ... ategory/30
or something for the same job at £7.63 https://www.autoelectricsupplies.co.uk/ ... ategory/30
take your pick.

As my battery is behind the seat out of reach in the case of a shorted cable near it I used instead a relay mounted at the battery with a switch on the instrument panel. The relay is a continuously rated commercial vehicle one made by Bosch and cost about £14 I think. It's interchangeable with the one that LAS do for about £38. Worth considering.

I see you're back at KH, I can show you it.

Re: Replacement for Lucas battery master switch.

PostPosted:Tue Apr 16, 2019 3:33 pm
by Charles Hunt
Thanks Mike, I found a copy type on line and that should arrive tomorrow. Are you at the airfield this week? My trip away reduced to 2 1/2 days!