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SPDT
(Single Pole / Double Throw) Relay - Form C
Many
of you have asked me to explain how the SPDT relay is wired
for your fans, fuel pumps and a host of other automotive electrical
needs. As you ask for these, I have posted them on our forum
and website. It is fine to see the entire circuit, but I thought
that you would better understand the relay if you could see
it work switched and unswitched.
This relay has posts 30 & 87a internally connected. When
switched, the path changes to posts 30 & 87 and 87a becomes
an open circuit.
Switching
the relay is accomplished by issuing a ground and 12v on posts
85 and 86.
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