RV8 front indicator lamp - connector terminal corrosion
Brian Moyse (BRG 1714) recently had to replace the offside
front indicator lamp assembly on his car after it stopped working.
The problem was traced to corrosion of one of the connection pins
of the bulb holder where the wiring loom connector is plugged in.
lamp unit is simply removed by undoing the two screws on the front
lens of the unit and pulling the unit out of the front bumper. The
bulb holder is removed from the lamp unit by twisting it anti-clockwise.
On inspection, the bulb holder has two fragile looking male connector
pins. One appears to be in copper alloy and connects through to the
body of the cap of the bulb. The second connector pin appears to be
made from plated spring steel and connects through to the terminal
on the end of the bulb, this terminal had simply disappeared as a
result of corrosion.
for the corrosion is that the indicator lamp assemblies are mounted
in the front bumper moulding directly in line with the front road
wheels and are therefore blasted in wet weather by whatever mixture
of road salt, dirt and water that is around. The connectors on the
wiring loom are effectively open and unprotected from the elements,
there is no rubber boot fitted, and the corrosive mix will inevitably
find its way onto the bulb holder terminals. Once there it will remain
damp for some time and do the damage. The female connector terminals
in the wiring loom connector block itself do not seem to have suffered,
probably because they also are made from copper alloy.
my lamp unit, I have over-wrapped the connector and bulb holder assembly
with a self-amalgamating electrical insulation tape (sometimes
Brian Moyse (BRG 1714) from Surrey
known as Poly
Iso Butylene or PIB tape). This is an elastic tape which when stretched
over itself will amalgamate into a homogenous water proof mass and
firmly grip the object to which it is applied. Hopefully
this will delay a reoccurrence of the problem on my new lamp unit.
A spare lamp
unit has been ordered from MG Rover, as no doubt near side unit failure
will not be far behind. Delivery took about two weeks and the part
number is RZKC6428 and the current price is £22.65 plus
VAT. My next job is to check out the front fog lamp units which are
in a similar location.
reserved by the V8 Register