In reply to a message from tmac sent Tue 10 Aug 2010:
Tom,
On Saloons I have seen two different types of resistors on the
panel light switches, and I see no reason to believe that the E
would be any different. The first type has a carbon lozenge which
is removable, being held in with spring arms, the other has an
array of 3 resistors in parallel, being rivetted/soldered in place.
The resistance is located on the upper surface of the switch, as
should be, to minimize any heat damage to the switch body.
Presumably someone pointed out that the removable lozenge was a
possible point of failure in the same manner as the fuseholders
lose their hardness and thus the lozenge type was improved.
The resistance is in the 3 to 4 Ohm range, the resistors are
about the size of a normal 1W carbon resistor. Using 3 resistors in
parallel will give you 3.1 Ohm total if you use 10 Ohm, 3.6 Ohm if
you use 11, and 4 Ohm if you use 12 Ohm. The only thing you really
need to pay attention to is the 1 watt value, these being about
3/4’’ long which is fine both physically and electrically. The total
Ohmic value of the array is not really critical, and you’re not
really going to use them anyways, so if the shop only has one of
the 10, 11, or 12 Ohm values take which ever they have. as far as I
remember 10 and 12 Ohm are standard values for 1W resistors.
Tolerance is also not critical.
Andrew–
The original message included these comments:
If one of the '‘lectrical’ experts on here would care to suggest a
radio shack alternative, I’d be interested and grateful. I have no
idea what the resistance rating was, or whether it requires some
special resistor.
–
1968 3.8S
Zurich, Switzerland
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