[Healeys] Polarity

[i erbs]

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> 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
> <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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