Wire size for Hobbs switch? - EvoXForums.com - Mitsubishi Lancer Evolution X Forums
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Evo X Performance General discussion for performance topics that are unique to the Evo X. IF THE TOPIC IS COMMON WITH OTHER LANCERS, PLEASE POST IT IN: '08+ Lancer Common.
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Old 01-17-2019, 02:09 AM   #1
smash493
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Wire size for Hobbs switch?

Currently wiring in a radium in tank double pumper, both pumps wired with the radium relay. I am running a Hobbs switch for the 2nd pump, Hobbs in engine bay, and will be completing the ground. Running that long of a wire, from front to back, what would be a safe gauge of wire? Also I ran my 12v from the factory fuel pump to trigger both relays, is this safe or should I have 2 separate 12v triggers, one for each relay? Thanks
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Old 01-17-2019, 01:16 PM   #2
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Dual 450s? If so you need a aftermarket guage wire for both I would think. Or just one bigger wire like a 6 guage or something. But if they are like dual 320s you should be able to get away with the primary running off the stock power and the other with a 10 to 8 guage power wire.
I just have 1 450 ran with a 8 guage relay kit.
(Obviously any afternakert wire being relayed and all)
If you dont plan on pushing over 600whp (mustang) a single hard wired 450 should put out enough fuel for it.
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Old 01-17-2019, 01:28 PM   #3
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Yes dual 450s, going e85 6266 next year but running e85 bb fb black this year on a built 2.2. The relay kits i have from radium both have 12 gauge power wires, seemed small to me, but this is my first time messing with wiring.
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Old 01-17-2019, 04:56 PM   #4
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Assuming that its copper wire you should be fine. As long as you run both cables individually, not run both pumps from one.
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Old 01-17-2019, 11:44 PM   #5
turismolover22
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Personally I would run the hobbs to a relay. Keep the power wire as short as you can.

Hobbs-relay-fuel pump
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Old 01-17-2019, 11:53 PM   #6
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As far as the relay is concerned, having two hooked up in series is fine. The pump power wire is merely a trigger, you are not carrying over a load and stress driving the trigger side of the relay. But since you're going to activate the second pump separately, you will need to find an appropriate signal to do so, and thus, separate relays
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Old 01-18-2019, 02:25 AM   #7
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I do have 2 relays, one triggered by factory pump wire and one by the Hobbs. My main question is regarding the gauge of wire running from the Hobbs to the second relay. I have a 16 gauge wire ran from the Hobbs switch in the engine bay to the 2nd relay in the trunk to complete the ground on the 2nd relay. Is a 16awg wire to small for that long of a ground?
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Old 01-18-2019, 03:50 PM   #8
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the wire from the hob switch to the relay is a signal wire so you should be fine with running the 16 gauge as its primary function is to tell the relay to send power to the pump. So 16G wire wouldn't matter in this scenario. What matters is the wire powering the actual relay which should come straight from ur battery.
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Old 01-19-2019, 09:22 PM   #9
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Quote:
Originally Posted by jimmy_teeee View Post
the wire from the hob switch to the relay is a signal wire so you should be fine with running the 16 gauge as its primary function is to tell the relay to send power to the pump. So 16G wire wouldn't matter in this scenario. What matters is the wire powering the actual relay which should come straight from ur battery.
Thats what I would say. Make sure the wire is of an appropriate gauge to carry the voltage/amperage draw, and you're fine. It't only a trigger switch, it isn't carrying a high load.
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