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From: Bob Lowe (no email)
Date: Thu Oct 02 2003 - 09:07:35 EDT
Most boats have two temperature senders, one for the basic alarm system that
is energized when you turn the ignition switch on that may also be tied in
with the oil pressure alarm and one for the gauge(s).
The one for the alarm system is usually a simple normally open switch that
closes when high temp is reached, setting off the alarm. This sender/switch
usually has only one wire as it picks up the negative voltage from the
engine itself, though some have independant wire in as well as out. You can
jump the terminal with the ignition switch on to see if the alarm goes off.
The one for the guages is a variable reading sender that varies its
electrical strength depending on the temp it is reading. They normally have
two different senders, one for a single station and one for dual stations.
Testing for continuity is not always a reliable test as you can get a
reading from the other end in many cases. You should be able to identify
the sender for the alarm by jumping the terminal(s)and the one for the
gauges by disconnecting the wire(s) at the sender. If testing the sender
for the gauges, disconnect the wire(s) first so that you are testing only
the sender and to avoid backfeeding.
Good luck,
Bob Lowe
>>>>I've been puzzling over the same question as I've been fighting with my
new temp gauge(s). There were suggestions from members of the list that
one of them was for an idiot light, and one was for the gauge. If one
is for an idiot light, it's aptly named because this idiot can't seem to
locate it. While trying to track the wires I ended up getting confusing
signals from the two because I seemed to get continuity between the two
when the upper gauge was connected. Of course the wires disappear into
a harness that emerges some 20 feet away in the helmstation, so it's a
bear to try and track. They look identical except one has a screw
connector and one has a spade connector. I know that they do not feed
the two different gauges now, as I had to replace both gauges to get
them to read the same, although now they both read about 20deg low. I
might have to change the sender(s), but don't know if I need to replace
one or both.
I found these two articles on the Faria site which deals with
troubleshooting temp gauges, which you might have a look at. As for
your particular problem, I'd be looking for a poor connection or broken
wire on the 12v, ground or signal wires, which is breaking the
connection intermittently, and causing it to drop to zero.<<<<
>When attempting to remove the sender I noticed there are
>two senders on the foreword pump side of the engine.
>Can anyone explain to me the purpose of
> the two senders?<
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