[Mgs] mga 1500 with early 5 main mgb engine

[Paul Hunt]

Not an MGB reference number, it looks like it has later internals than 
but would still be the current-operated type i.e. RVI where the power to 
the coil comes via the tach.  The ignition switch would be connected to 
the male bullet and the female bullet to the coil.  12v (also from the 
ignition) to the spade and earth to the case.  When used on the MGB 
there were separate wires from the ignition switch to the spade and to 
the male bullet but you can tee from one to the other rather than 
running a separate wire.

It would have been helpful to see the top half of the dial where it 
might have shown RVI and what polarity it was.  I suspect it would show 
positive earth, but those electronics would have been used with negative 
earth in an MGB for example so it looks like it has been converted by 
swapping the guts instead of swapping the wires round internally.  If 
that tach was used after the car was converted to negative earth it 
would make sense.

PaulH.

On 31/07/2023 01:22, dave northrup wrote:
>
> Negative ground, car runs smoothly, need to install the electric tach 
> which supposedly was previously installed in this car and working.
>
> On the back view, what hooks up where?  I am pretty sure the tab, and 
> the screw, are ground.
>
> The other two – one needs to go to power and the other to the coil.  I 
> think one is a female bullet connector; the other is male.  Which goes 
> to power and which to the coil?
>
>
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