Fuel pump, electric choke and windsheild wipers on same wire - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-05-2008, 04:20 PM
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Fuel pump, electric choke and windsheild wipers on same wire

Hey guys, would I be able to splice my electric choke and electric fuel pump both off of the ignition wire going to my windsheild wipers?? I can't seem to find any other accessory to splice off of without someone saying "NO DON'T SPLICE OFF OF THERE!!" I guess splitting the power between any two things will lower their output.

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Old 06-05-2008, 04:34 PM
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You can trigger the fuel pump relay with that wire, but I wouldn't run the pump directly from it.
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Old 06-05-2008, 04:39 PM
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Elliott is correct. The relay amp draw is minimal. Pump draw is high.
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Old 06-05-2008, 06:09 PM
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Oh I forgot to mention, I'm not using a relay....
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Old 06-05-2008, 06:27 PM
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Then there is virtually no place you can safely tap without problems. Buy a relay, they are cheap and easy to hook up. It will make sure you always have a good clean current going to your pump. Without one, you are just setting yourself up for problems. Spend the $6, do it right, then you won't have to do it again. If you run it directly off any switched circuit, it WILL burn out your ignition switch.
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Old 06-05-2008, 06:58 PM
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What kind of relay do I ask for??
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Old 06-05-2008, 07:03 PM
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Basically any 4 pin SPST 12v relay, preferably 20amp or higher.

This would be fine:
http://www.radioshack.com/product/in...ductId=2062477
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Old 06-05-2008, 07:17 PM
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Pizzaman, here's a good thread about relays for different accessories.
A question for you electric choke guys
And this link that carsavvycook posted in his post.
http://www.6066gmcguy.org/BoschRelay.htm
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Old 06-05-2008, 07:23 PM
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Pizza:
I thought this had all be covered, including the instructions on how to wire it here yesterday?

Commonly known as "the Bosch relay" ... it is available with or without a mounting bracket.

NAPA Grote 448405 relay

Have a good look. It's the same relay as the Radio Shack one in the preceding reply.

I'm not sure how many amps your fuel pump draws, but according to the instruction sheet at the link I posted yesterday ... that Holley choke cap only draws 10 amps. Therefore ... if your fuel pump draws less than 20 amps, you could theoretically run both devices from one 30 amp relay.

I would recommend installing an in-line fuse between the battery power and the relay ... as close to the source as possible. "The source" COULD be the big terminal on the starter.
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