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Battery
Drain
Do you have an electrical draw on the battery of your MG? Of course
many, many things could cause a drain on the battery of your MG.
One obscure component I found, was the 'Anti Run On Valve'. This
component was fitted to all MG's from 1973 to the very last MG that was
produced.
The purpose of this component, as its name implies, is to stop your
engine from continuing to run when the ignition key is turned off. It is
a small metallic cylinder with a single vacuum outlet and two wires
sticking out of the very top. The vacuum hose goes directly to the
intake manifold.
This is how it works, when you turn off the ignition key. The valve is
electrically energized and is grounded by it's own oil pressure switch.
When the oil pressure switch fails, it leaves the 'Anti Run On Valve' in
a continuous energized state, thus draining the battery
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"Warning" when replacing the oil pressure switch, you must obtain the
correct switch for this application. It may look like a regular oil
pressure switch but internally it is different.
I had customers who saw this switch was leaking oil and went to Napa
Auto Parts for a replacement, only to find out they had now created a
drain on their battery.
On the MGB, this oil pressure switch is located in an oil line in the
engine compartment bulkhead. On the Midget, it is a two prong switch on
the drivers side of the engine block.
Paul Lewis |
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