| You
may look at the diagram above and think that it looks very confusing.
It could be until you break it down. It is easier to wire the
circuit, than it is to diagram it. Here’s the break down:
Think
back at the diagram on the SPDT relay. The un-switched (unlatched)
path is on posts 30 and 87a. By passing a + and – on
posts 86 and 85 the path is “switched” to 30 and
87. (87a becomes an “open” circuit). In this example,
we will change the path to go the opposite direction. Instead
of the circuit passing from 30 to 87a or 87, we will be passing
from 87a or 87 to 30. Still with me? Hope so, it’s not
as difficult as it seems. Now for how this works.
Switch
– This is what got you into this situation in the first
place. You had to have a switch that wasn’t rated to
power the window motor. The switch will be connected to a
good ground. When you press the switch in either direction,
a ground will be passed to one of the relays to cause it to
latch.
Relays
– In the normal state, (unlatched / un-switched), the
relays will pass a ground to the motor from post 87a to the
outbound post 30. When not switched, a ground will be present
on both sides of the window motor. When you press the button
/ switch, you will send a ground to post 86 of the relay to
cause it to latch / switch. This will cause the 12v waiting
at post 87 to pass to the outbound post 30 and off to one
side of the motor causing it to spin in a given direction.
Hint:
Label each switch and relay as to their function. This will
make life easier if you have a relay go bad at some time.
Click
here to download and print any of our diagrams from our documents
page
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