[Healeys] Master Switch

[Michael Oritt]

For my money (and car) I opted for a high quality marine-grade shutoff
switch such as that made by Hella and others, sold on the Pegasus site.

On Wed, Mar 25, 2020 at 4:31 PM Michael Salter <michaelsalter at gmail.com>
wrote:

> My experience with the original Lucas Master switches has been a little
> different.
> Many years ago, after having a newly installed NOS switch fail on my own
> car, I  discovered that it had failed because the ground cable running from
> the switch to the frame was not properly installed.
> The full starter current must pass through the switch then through the
> cable to ground. When there is resistance in that cable current passes
> through THE SPRING to then ground through the body of the switch and the
> switch mounting bracket.
> This high current rapidly overheats the spring and it looses tension
> ruining the switch.
> I have disassembled several of these switches to stretch the spring as
> suggested but often found that the brass of the spring had been totally
> annealed as a result of being overheated because of the current that had
> passed through them.
> For my own car (and several others since)  I made a new spring from copper
> coated steel welding wire wich lasted until I sold the car many years
> later.
>
> M
>
> On Thu, Mar 26, 2020, 9:00 AM John Spaur, <jmsdarch at sbcglobal.net> wrote:
>
>> In my experience with the switches they overheat and the spring collapses.
>>
>>
>>
>> Good to know you have the rivets.
>>
>>
>>
>> John
>>
>>
>>
>> *From:* David Nock [mailto:healeydoc at gmail.com]
>> *Sent:* Wednesday, March 25, 2020 7:57 AM
>> *To:* John Spaur <jmsdarch at sbcglobal.net>; 'Healeys' <
>> healeys at autox.team.net>
>> *Subject:* Re: [Healeys] Master Switch
>>
>>
>>
>> The number one fault with both the original and the new switch is the
>> spring inside looses its tension and you then loose the ground connection.
>> We have sourced the correct rivets to restore your original battery switch.
>>
>>
>>
>> I have also had to take apart the new switches to make them work
>> correctly. Simply drill out the rivets. Stretch out the new spring and
>> install new rivets.
>>
>>
>>
>>
>>
>> David Nock
>> healeydoc at sbcglobal.net
>> 209 948 8767
>> www.britishcarspecialists.com
>>
>> Help us have our Founder Norman Nock inducteed into the
>> British Sportscar Hall of Fame, You can vote for your favorites
>> by visiting the site at.
>> www.britishsportscarhalloffame.org
>>
>>
>>
>> *From:* John Spaur
>>
>> *Sent:* Tuesday, March 24, 2020 9:53 PM
>>
>> *To:* 'Healeys'
>>
>> *Subject:* Re: [Healeys] Master Switch
>>
>>
>>
>> I have tried to post this to the list several times but it keeps bouncing.
>>
>>
>>
>> The internal part in the reproduction switches is plastic, not Bakelite.
>> If your engine is hard to start and you crank it too long the plastic part
>> melts and the switch is toast. I rebuilt one recently with the proper
>> Bakelite part. However, they are not always interchangeable with the newer
>> metal case because the metal case is slightly smaller.
>>
>>
>>
>> John
>>
>> ’62 BT7
>>
>> San Jose, CA
>> ------------------------------
>>
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