VIAIR 93940 40 Amp Relay Use and Care Manual

Compressor Wiring Diagram
=
| Compressor ©
BS —
835
+12 VOLTS aa | | |
aD
| 30
= Relay
Pressure
Switch
In simple terms, arelay 1s a swatch, A relay
has two circuits built into it, The smaller (+) Battery —
circuit activates he larger circuit when power
Is applied to It, This allows a lower power
switching of ign power components. A
pressure switch is a lower power component,
and a compressor Is a high power component,
Rel avs are needed with compressors, one for
every compressor, One pressure switch CAN
BE USED with multole relays, so vou Em
need one pressure switch for your truck
long as your tanks are linked together, y OL
have more han one,
Wr ng Suggestions: | |
“The compressor can plug directy into the 87
prong on the rel ay.
*+12v on the pressure switch can come from
anywhere, À common places a wire that
has power anly when the vehicle 1s on,
P/N 93940 VIAIR
Four Fiat Arr Source