[Saloon-lovers] Jaguar MK IX- changing polarity

I’m rebuilding my MK IX-1961. Normally plus is giving on car body.
I want to change this polarity on let’s say normal one, because I
want to placed the modern radio set. Cen You help me and explain
what is neccesary to do. Is it possible? How to change the
connections in dynamo, regulator, and other electric equipement.
But maybe it will be better to find the modern radio set with
changed polarity? (if they are exist on the market).Mayby You know
the type and producer?. Waiting for Your checked advices. Best
regards. Zbigniew–
Zbigniew MK IX
Ostrowiec Swietokrzyski, Poland
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In reply to a message from ryba570 sent Mon 15 Aug 2011:

There should be a lot on this in the archives about this as
it is a common modification, but essentially you reverse the
terminals on the battery, (if you are still using the dual 6
volt batteries this may require some redoing of the cables),
reverse the low voltage wires on the ignition coil and
reverse the connections on the ammeter so it reads properly.
If you have an original working clock (highly unlikely)
this will not work as the Smiths clocks are polarity
sensitive. And finally you repolarize the generator.–
The original message included these comments:

I’m rebuilding my MK IX-1961. Normally plus is giving on car body.
I want to change this polarity on let’s say normal one, because I
want to placed the modern radio set. Cen You help me and explain
what is neccesary to do. Is it possible? How to change the
connections in dynamo, regulator, and other electric equipement.


John Quilter 1965 3.8S, 1951 MGTD, 1960 Morris ,1990 XJ6
Eugene, Oregon, United States
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In reply to a message from ryba570 sent Mon 15 Aug 2011:

Zbigniew,

Welcome to the list. Take a look at
http://www.jag-lovers.org/ebooks/view.php?
Vbook=Saloons&Vsection=17

Paul–
The original message included these comments:

I’m rebuilding my MK IX-1961. Normally plus is giving on car body.
I want to change this polarity on let’s say normal one, because I
want to placed the modern radio set. Cen You help me and explain
what is neccesary to do. Is it possible? How to change the
connections in dynamo, regulator, and other electric equipement.


PS
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I personally would not change the polarity of the whole car just for the radio.
I just installed a negative ground radio in my positive ground Mark-IX and it
works great. There are a couple of tricks I used and I would be glad to share
them with you if you just contact me. Or, if others are interested I will post
the procedure here.

Glenn Smeed
Eugene, Oregon
@Glenn_Smeed
1959 Mark-IX
(will be on display this coming weekend at the Cottage Grove, Oregon Concours de
Elegance-although, with the original stock radio)Date: Mon, 15 Aug 2011 05:15:32 -0700
From: “ryba570” zbych570@poczta.onet.pl
Subject: [Saloon-lovers] Jaguar MK IX- changing polarity

I’m rebuilding my MK IX-1961. Normally plus is giving on car body.
I want to change this polarity on let’s say normal one, because I
want to placed the modern radio set. Cen You help me and explain
what is neccesary to do. Is it possible? How to change the
connections in dynamo, regulator, and other electric equipement.
But maybe it will be better to find the modern radio set with
changed polarity? (if they are exist on the market).Mayby You know
the type and producer?. Waiting for Your checked advices. Best
regards. Zbigniew

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In reply to a message from Glenn Smeed sent Mon 15 Aug 2011:

The only trick is to make sure the chassis of the radio never
contacts any earthed part of the car–otherwise the radio does not
know the polarity or the car.–
The original message included these comments:

works great. There are a couple of tricks I used and I would be glad to share
them with you if you just contact me. Or, if others are interested I will post


JCRC SE member JCNA Publications and Authenticity Desk
Columbia SC, United States
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In reply to a message from PS sent Mon 15 Aug 2011:

This section currently maintained by Pascal Gademer- not possible
to open
Maybe after some time

Zbigniew
MK IX–
Zbigniew MK IX
Ostrowiec Swietokrzyski, Poland
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In reply to a message from John Quilter sent Mon 15 Aug 2011:

Are the other equipement like wiper motor, or fuel pomps etc. are
not sensitible for polarity ?–
Zbigniew MK IX
Ostrowiec Swietokrzyski, Poland
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In reply to a message from ryba570 sent Mon 15 Aug 2011:

If you are making a change just for a radio. Do it the safe way and
use an inverter. Did it with our 61 Mk 2 . Cost was around $90
for the inverter. It just wires in to the power source, changing
the polarity.

Kim R.–
sportscarguy
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In reply to a message from ryba570 sent Mon 15 Aug 2011:

Wiper motor, heater motor, lights are not polarity
sensitive. The fuel pumps might be but only if they have a
round resistor under the cap which is there to prevent
excessive arching of the points. Some SU pumps do not have
this feature included.–
The original message included these comments:

Are the other equipement like wiper motor, or fuel pomps etc. are
not sensitible for polarity ?


John Quilter 1965 3.8S, 1951 MGTD, 1960 Morris ,1990 XJ6
Eugene, Oregon, United States
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In reply to a message from John Quilter sent Mon 15 Aug 2011:

With regard to the fuel pump resistor that somebody has mentioned
in one of the replies. Does this just need to be unsoldered and
swapped around.
I understand that overheating of the pump can occur if this isn’t
done.
Anybody got more details on this, as it is often overlooked?
Polarity changes don’t affect the wiper motor.
The chances are the clock doesn’t work anyway!
So, it’s coil, dyanamo, pumps, and clock.
Personally I would look for a period Positive earth radio on e-bay.–
The original message included these comments:

round resistor under the cap which is there to prevent


MK9.
Yorkshire, United Kingdom
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In reply to a message from George Camp sent Mon 15 Aug 2011:

You can’t isolate the radio and have a good signal because the
aerial is (or should be) well grounded. Expect smoke!!

Art–
The original message included these comments:

The only trick is to make sure the chassis of the radio never
contacts any earthed part of the car–otherwise the radio does not
know the polarity or the car.


ARTIEFARTY
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In reply to a message from ARTIEFARTY sent Tue 16 Aug 2011:

I understand that is a capacitor in the fuel pumps, I have them on
my 1966 model, I do not think they are found on the 1961 models.
In any case they are located under the cap of the pumps and can be
reversed if found.
About 50 mFd capacitor.
P.–
Peter J. Smith, 1966 3.8S MOD
Carson City Nevada, United States
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Early Smiths clocks were not polarity sensitive, but after November of 1963
Smiths added a rectifier to try to make the clock more reliable. Notice
that I said “try”. Anyway, the polarity sensitive clock is characterized by
a black insulator on the power lug (difficult to see) and also the number
“CE1111/01” on the clock face. Your car originally came with a clock that
doesn’t care, but if you happen to have a /01 clock please disconnect the
power wire even if the clock doesn’t presently work. Sometime in the future
you may want to have a working clock, and from a clock repairer’s point of
view there is a big difference between a clock that has stopped and one that
has caught fire.

Mike Eck
New Jersey, USA
www.jaguarclock.com
'51 XK120 OTS, '62 3.8 MK2 MOD, '72 SIII E-Type 2+2

If you have an original working clock (highly unlikely)
this will not work as the Smiths clocks are polarity
sensitive.


John Quilter 1965 3.8S, 1951 MGTD, 1960 Morris ,1990 XJ6

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In reply to a message from Mike Eck sent Tue 16 Aug 2011:

Right - the one that stopped tells you the exact time the car left
the factory and the one that caught fire smells bad.
P.–
Peter J. Smith, 1966 3.8S MOD
Carson City Nevada, United States
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