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I run a constant voltage soleniod on my car. There is no need for a relay then. The constant voltage soleniod will only need 9v to activate it. Yhe pump will get full power then. Just a thought..

I run both of my pumps off the constant voltage soleniod.

And no it is not a ford soleniod.. They are not intended for constant power.




What exactly do you think that style solenoid is?


It's a relay with the ground circuit internally grounded...



As far as powering the trigger of the relay off the ballast, either would work but I'd use the battery side...

"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."