Rebuild
report 5
The wiring loom of my MGBGTV8 was not in bad condition,
but they always have a few small problems. This one had a broken
connector to one of the cooling fans - see photo above (Wiring
3).
When I removed the outer layer of loom tape, I found
evidence within the loom that some extra wires were
added by the Factory. Presumably they modified the
1800 loom. For example, the pink resistive ballast
wire that powers the coil was found to be taped to the
loom and then covered with a second layer of black loom tape
- see photo above (Wiring 2). This pink wire will be removed
from the loom and replaced with a plain white wire, because
I always fit a Pertronix electronic unit inside the distributor,
and it requires an un-ballasted 12-volt supply.
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While the loom is out of the car I like to take the opportunity
to make a few subtle alterations and improvements.
Cooling fans relay
I don't like the way that the power for the cooling fans
has been taken via the ignition switch (green wire).
When these two fans kick in, there is a surge loading
in excess of 15 Amps, which the ignition switch is
not designed to take. Therefore I just use the green
wire to power the switching side of the relay, and I
take a new power feed directly from the alternator via
a brown wire - see photo above (Wiring 1). This means the supply
is not fused, so I replace the standard Lucas relay with a fused
relay.
Twin horns relay
Also, I don't like the way the twin horns are wired
without a relay, placing a large load on the horn button. I
therefore add yet another relay to make the horns more reliable.
See a larger copy of these photos. More |