Date: Mon, 14 Apr 2003 12:31:53 +0200
From: <Peter.Bona@vodafone.com>
Subject: O/D relay
The weekend I fried my D type overdrive relay. One of the points has
been badly burnt, so no chance to repair it. I found a local non LBC
supplier having relays, I think these are mostly horn or headlamp ones.
My question is, that what differences are between 3 and 4 point relays?
In spits O/D has 4, horn has 3 points relays. As I have checked on the
diagram, the O/D relay is connected by two wires to the 12V, a brown and
a white one. It seems to me that the brown is constantly on 12V as the
white only with the ignition on. So why is it like this? Do I really
need a 4 point relay or 3 point is good as well? And what about the
current? 20A should be enough or it is better to have more.
thanks for ideas,
peter
ps: 68' mk3
Peter, many years ago (20 +) I tried to use a horn relay for an od relay on a
TR3A and I found that after several continuous hours of running, the relay
would burn out. It would last for several weeks but eventually give up. I
believe that there is a difference in that the od relay is meant to be a
maintained relay and the horn relay is just a momentary type relay and as a
result it may not last. You never know though, relays now a days may be
different or just a different manufacture may make one that lasts. It's worth a
try if you go down to the wreckers and pick up a few for a few dollars. If your
buying a new one, see if they have a maintained one, maybe one from an air
conditioning circuit might do the trick.
Larry Ternowski
Langley BC
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