wiring diagrams for valves

just wonderin if anybody has a wiring diagram for smc valves? should the ground wire go to the battery or just ground it down to metal?

Down to metal is fine.

never ground directly to the battery with anything. closet to the valve as possible to keep wiring to a minimum. crimp an eye terminal and use a self taper to secure it.

thanks man

my smc's dont make any noise when i ground them to metal

If your tring to ground them to your bed it might not work because most beds are not grounded. You should be able to ground it to the cab/frame. Then just hook the other wire to the switch er whatever. So you should have 2 wires one you would ground to (-) and the other you would hook up to (+) however that may be Ex. switchbox,switch

Not many people trigger valves on the ground side. Even tho this would be the safe way to do it.

If you need a diagram I can make you one real fast but its not really that hard. All it is isa 12vdc coil.

Originally posted by SuperD



If your tring to ground them to your bed it might not work because most beds are not grounded. You should be able to ground it to the cab/frame. Then just hook the other wire to the switch er whatever. So you should have 2 wires one you would ground to (-) and the other you would hook up to (+) however that may be Ex. switchbox,switch

Not many people trigger valves on the ground side. Even tho this would be the safe way to do it.

If you need a diagram I can make you one real fast but its not really that hard. All it is isa 12vdc coil.

If you trigger with the ground side you would have 8 live wires at all times, I don't think that is really safe.

well im not going to fight with you about it. But jist think most of all coils/motors/injector's on all cars/trucks are ground triggered by N-Channel MOSFET's and/or switch's by digital PWM and/or analog inputs. Say if the switch shorts out it will not start a fire if the case of the switch is grounded but you make a good point too but by the statement I made I was just saying there are (2) ways "ground triggered" and "positive triggered" sence the question was about how to wire them up

just a note.......the battery ground goes to the frame......so grounding somthing directly to the battery temporarily would be the same point electrically in a schematic. it is safe to do it so long as the battery is grounded to the frame or has a good ground to body, and a good body to frame.

Nothing to fight about. Your statement suggests running 8 live wires to the valves which would be dangerous. Pulse width modulation is used for injector drivers for accurate control not fire risk. I've been using Motec and Haltech for about 12 years now and yes it's true they use ground side switching, but that isn't directly to the device. It's to switch a relay, which is located close to the ecu, so that there aren't live wires running all over the vehicle when things arent being used. It sounds like you know this already but in your original post it didn't appear so, and I'd hate to see some guy with an octopus of 8 live wires zip tied to the bottom of his truck. PWM and N-Channel Mosfets I think is taking it alittle far, a ground switched, fused relay close to the switch would be fine but we are talking 3 amps here.