Pasanville@aol.com writes:
>Why does my heater motor run intermittently? I can turn it on high and
>low
>but it only operates for about 10-15 seconds. Anyone with ideas.
You want ideas? Here are some ideas:
A motor runs when there is current flowing. The current path goes from
battery through fuse, switch, wire, motor, then the return path is
(maybe) through the chassis.
Any problem anywhere in the chain can cause a malfunction. However your
description of it operates (always?) for about 10-15 seconds, (then
stops completely?) would lead me to think:
most probably a thermally induced problem. Presumably you can switch the
motor on and it runs for 10 seconds then shuts down because the wiring
is heating and a flaw in the circuit is opening. Maybe in the brush,
maybe in the commutator, maybe in the windings.
I doubt that a switch, or wiring, would act like that. A loose
connection *might* operate like that, so don;t rule that out. You could
jiggle the wires at all connections that you might reach. Ground
connections have a shady reputation on British cars.
Good luck,
-Roger
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