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Re: Alternator to power fuel pump? [message #370442 is a reply to message #370436] Fri, 02 September 2022 06:28 Go to previous messageGo to previous message
RF_Burns is currently offline  RF_Burns   Canada
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
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Senior Member
Matt,

Just use the alternator voltage to power the coil of a cube relay. Then pass the power from the battery through the relay to power the pumps. A push-button momentary switch can give you a prime function before starting the engine. If the alternator fails, simply move the power wire from the N/O to the N/C side of the relay.

My coach has Daytime Running Lights which are activated through a relay wired this way.

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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