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post #1 of 11 Old 05-14-2018, 08:07 PM Thread Starter
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inertia switch

I'm adding a toggle switch to run my fuel pump (magnafuel protuner 625) I want some safety though, in the case of a crash. Is there a way to wire in a factory inertia switch in conjunction with my toggle switch and relay? Or Maybe there is a better way to still have a toggle switch but kill fuel in the event of a crash.


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post #2 of 11 Old 05-14-2018, 11:06 PM
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wire it in series with it.

or a relay

pretty simple


89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #3 of 11 Old 06-14-2018, 10:13 PM Thread Starter
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Looks like the inertia switch could be wired as follows. Power from toggle switch to inertia switch, then from inertia switch to fuel pump relay. Then again as I type this while looking at the diagram I second guess myself.

http://www.veryuseful.com/mustang/te...ng_Diagram.gif

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post #4 of 11 Old 06-14-2018, 10:30 PM
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that switch takes line voltage

in that diagram

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #5 of 11 Old 06-14-2018, 10:48 PM Thread Starter
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I need to go read more about switches, relays, and automotive wiring more.

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post #6 of 11 Old 06-15-2018, 12:59 AM
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all circuits consist of power and a load

that is it

the rest are just switches to control the powering of the load

its all very simple, when you learn the legend and what to look for

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #7 of 11 Old 06-15-2018, 09:20 AM Thread Starter
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The addition of the inertia switch is throwing my limited electrical knowledge into a tailspin, or I'm making it more difficult than it really is.

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post #8 of 11 Old 06-15-2018, 10:22 AM
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It’s like a light switch, on or off

Has 2 terminals, you must be making more of it

Do you want to have part of the FP relay control instead?

What is it that is confusing you?

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #9 of 11 Old 06-15-2018, 12:46 PM Thread Starter
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Indy, I sent you an email, that is if your address is the same from a few years ago. Does the inertia switch need to control the pump relay?

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post #10 of 11 Old 06-17-2018, 11:05 AM
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the inertia switch can be used to break the control or the line

the switch must be rated to carry the current of the load


89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #11 of 11 Old 06-17-2018, 11:12 AM
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Inertia switch should be used to control the fuel pump relay, as that presents only a 1 amp load. Switch can be used to control either the trigger or ground terminal on the relay.

In addition, it is not a bad idea to connect a oil pressure switch that disconnects the fuel pump when there is less than 6 or 10 lbs of engine oil pressure. This would be a redundant set up, in case the inertia switch fails to trip if something bad happens. I bought this Holley switch, but the OEM idiot light signal / circuit could also be utilized.
https://www.summitracing.com/int/parts/hly-12-810


I run both on my street car, and as mentioned, the circuits need to be in series so any one of them will shut off the pump.
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