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Brakes and Flasher Relay

Brakes and Flasher Relay

Hi to all
When I use the brakes or flashers, the 35 A fuse blows out, after a
(sometimes short) while. All lamp- connections seems to be OK. Yesterday,
when I turned of the flasher-lever, I notised a weak light in the flasher
indicator-lamp. It stopped when I turned off the ignition key - and on
again. The same thing happened when i knocked the flasher unit with a
screw-driver.
To day I replaced a new flasher-unit. But no, the fuse blew out. I didn't
touch the flasher-lever, but the brakes. Any idea? May be the flasher/brake
double relay. Is it possible that this relay can cause short-circut or
overload the fuse if for example pointers are burned?

(If I remember rightly, someone told about where to get a wiring diagram.
The car is recently rewired, so may be a wrong connection?)
- Martin Jacobsen

Hi Martin & all -- don't know what car you have, Martin, but the factory
wiring diagrams are in the Jaguar Service Manual. Call John Kubasak,
BRITISH VINTAGES, 800-350-5247 for the correct manual for your car.

In my original Mk IX, 792817 BW, there are four fuses -- 2 35a, 2 50a. Fuse
#4, 50A, controls starting carburretor, petrol gauge, screen wipers, heater
motor, stop lamps, reverse lamp, flasher unit and flasher lamps. Nine years
ago, I added a switch to control the starting carburretor, routing the wire
through the firewall with no rubber grommet. Three years ago, the fuse
started blowing because my extra wire had rubbed through at the hole --
blowing the fuse and leaving me without all the above. I just put a new
wire in (this time with rubber grommet at the firewall) -- no further
problems!
- Larry Martz

Our cars must be sympathetic, because mine is doing the same thing, but it
is when I use the left signal, and not every time, it only wants to blow
when I'm driving around, not when I have my head under the bonnet looking
for the cause.

Burned contact points wouldn't cause a fuse to blow; look for a wire or
something touching ground (earth) that shouldn't be. Disconnect and isolate
each wire (both ends) and use an ohmmeter or test bulb to see if they still
connect to ground.

I just looked up the price of this relay in Moss and its $165, ouch. Also
used on MGTD/TF/A incidentally. Somebody ought to come up with a transistor
mod for this thing like the SU pump mod.
- Rob Reilly

If you have any questions or comments send e-mail to: ted@jag-lovers.org
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