My car has the voltage regulator placed up next to the
battery. It has many extra wires and wire extensions taped to
it. I thought that it belonged somewhere on the firewall
below the fuel pumps…but now I see that the placement of the
oil filter and other things are in the way. Where does the
voltage regulator belong in a left hand drive Mark IV? 1948–
Dennis Trull
Lawndale, California, United States
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There is a picture of a LHD Mark IV in Joseph Wherry’s book “Jaguar Story”
with the voltage regulator way up on the left hand side of the firewall
about 4 inches from the bonnet edge, with what appears to be a fusebox
outboard of it at the same level.
Considering that the Mark IV was the first car to be produced in LHD, in
some ways they were a bit of a kudge job, and if the voltage regulator had
to be moved because of the steering column, extra wires and wire extensions
are very possibly factory work.
My USA version Mark V has extra wire extensions for the flashing turn
signals, not part of the main wiring harness. Most Mark Vs had trafficators,
but this is the way the factory did it for cars with turn signals.
Rob Reilly - 627933> My car has the voltage regulator placed up next to the
battery. It has many extra wires and wire extensions taped to
it. I thought that it belonged somewhere on the firewall
below the fuel pumps…but now I see that the placement of the
oil filter and other things are in the way. Where does the
voltage regulator belong in a left hand drive Mark IV? 1948
In reply to a message from R_and_J_Reilly sent Mon 6 Sep 2010:
The early cars had the regulator under the petrol pumps, where they
were more efficiently placed to catch weeping fuel and converting
it into fire.
Later Mk IVs had it up next to the battery with an alloy cover
with ‘Jaguar’ on it , rather like MK V/VIIs.
The main loom came in from behind the firewall so there should
not be too many stray wires.
Speaking of LhD MK IVs, does anyone know why I see pictures of
them with a strange horn button with what appears to be a small
chrome ring looking like a refugee from the Austin factory.
Not only on restored cars, but I’ve also seen them on pics of new
vehicles
I can’t imagine why the horn button would need to be different for
LHD.–
Ed Nantes SS
Melbourne, Australia
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In reply to a message from R_and_J_Reilly sent Mon 6 Sep 2010:
Sorry, small change of subject:
When was your MKV made Rob?
My MKV DHC ch. 647194 date of manufacture July 14th 1950 has
original flashers, no trafficators and the wiring is as per
the factory Service manual, except that for some strange
reason for the DHC the wiring is exactly like in the ‘‘RHD
for USA’’ schematic, which I think has got to be a typo
because AFAIK they only made these for the North American
market, in Europe and commonwealth countries they used
trafficators for a lot longer, also with MKVII’s.
Lucas Wiring Diagram No. W76422, which is for the Saloon (1949)
and the same for No. W76522 which says (LHD for USA) 1949
also Saloon, I guess they didn’t bother to do a new
schematic at all for the DHC, but it seems it is the same
except for the small differences of the interior light (No.
W76520 Coupe Mark V 1949 (LHD Export Models)) and the fact
that the routing of soem cables was a bit different due to
the different body and sills.
My hacked and in poor shape wiring harness does carry the
wires for the flasher, I will be replacing the complete
harness when the body comes of for repairs and a bare metal
respray, but I think that won’t be within a couple of years.
I think it was a pretty neat solution with a separate relay
and double filament bulbs in the front side lights and
double bulbs in the rear lights, in comparison to some of
the MKVII relay and combined stop light and flasher hassle.
Cheers,
Pekka T. - 647194–
The original message included these comments:
My USA version Mark V has extra wire extensions for the flashing turn
signals, not part of the main wiring harness. Most Mark Vs had trafficators,
but this is the way the factory did it for cars with turn signals.
Rob Reilly - 627933
–
MKV 3.5L DHC, E-type 2+2 Ser.1 MOD, XJ6C MOD, XJ8 Executive
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