[Healeys] Polarity

[Bob Spidell]

The article on healey.org documents tells how to convert an electronic 
tach.  For the mechanical ones, you just have to reverse the cable.

bs



On 3/7/2020 8:29 AM, i erbs wrote:
> What about tachometers?
>
> Ira Erbs
> Portland,OR
> 1959 Austin Healey BN4
> 1967 MGB
>
> On Sat, Mar 7, 2020, 6:00 AM Kees Oudesluijs <coudesluijs at chello.nl 
> <mailto:coudesluijs at chello.nl>> wrote:
>
>     The original pumps had a capacitor over the points which made them
>     dual polarity. At a later stage SU changed the capacitor for a
>     diode which made the pump polarity sensitive. If you remove the
>     diode and fit a transil over the points the pump becomes dual
>     polarity.
>
>     The very early pumps with the single points may not have had any
>     capacitor or diode fitted, which would lead to spark erosion of
>     the points. These were also dual polarity.
>
>     The later electronic/solid state versions are all polarity sensitive.
>
>     Kees Oudesluijs
>
>
>
>     Op 7-3-2020 om 14:49 schreef David P:
>>
>>     SU fuel pumps are generally polarity sensitive...
>>
>>
>>     On 3/7/2020 1:18 AM, Kees Oudesluijs wrote:
>>>
>>>     In addition to the article:
>>>
>>>     -Change polarity to the radio if fitted. Some older radio's have
>>>     a polarity switch.
>>>
>>>     -Check if clock is polarity sensitive. Some older Smiths/Jaeger
>>>     clocks are dual polarity. Later ones are polarity sentive.
>>>
>>>     -Change over the wires from the Amp gauge.
>>>
>>>
>>>     Kees Oudesluijs
>>>
>>>
>>>
>>>     Op 7-3-2020 om 04:48 schreef Max Byers:
>>>>
>>>>     See attachment.
>>>>
>>>>     Steve Byers
>>>>
>>>>     HBJ8L/36666
>>>>
>>>>     BJ8 Registry
>>>>
>>>>     AHCA Delegate at Large
>>>>
>>>>     Havelock, NC  USA
>>>>
>>>>     *From:*Healeys [mailto:healeys-bounces at autox.team.net] *On
>>>>     Behalf Of *ahbn6--- via Healeys
>>>>     *Sent:* Friday, March 6, 2020 9:32 PM
>>>>     *To:* Healey List
>>>>     *Subject:* [Healeys] Polarity
>>>>
>>>>     *Is there any step by instructions on how to change to negative
>>>>     ground?*
>>>>
>>>>     **
>>>>
>>>>     *John Sims*
>>>>
>>>>     *www.healey6.com <http://www.healey6.com/>*
>>>>
>>>>     *Matawan, NJ*
>>>>
>>>>

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