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Old 05-01-2014, 09:33 PM   #1
Faulty81
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Default Holley and cut off switch

Holley says TO THE BATTERY, but what if you're running a Cut off switch? Are there any problems running it to the cut off?
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Old 05-01-2014, 09:42 PM   #2
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Default Re: Holley and cut off switch

To the battery for the main power and ground. The switched power and injectors and ignition should all be cut off by the switch however.
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Old 05-02-2014, 09:49 AM   #3
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Default Re: Holley and cut off switch

Thanks Doug
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Old 05-04-2014, 03:11 PM   #4
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Default Re: Holley and cut off switch

I put the power wire to the car side of kill switch and the ground directly to bat.
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Old 05-04-2014, 05:39 PM   #5
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Default Re: Holley and cut off switch

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Originally Posted by skeletonpsycho View Post
I put the power wire to the car side of kill switch and the ground directly to bat.
Is the kill switch only for ECU Power?
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Old 05-04-2014, 06:37 PM   #6
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Default Re: Holley and cut off switch

If you were to wire it to the cutoff side,would it be necessary to perform the TPS learn when power was cut ? Not really wanting to dick with my car in the tech lanes,would be easier to kill power to ign switch/fuel pump and wire master power to ECU direct. Thought ?
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Old 05-04-2014, 06:39 PM   #7
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Default Re: Holley and cut off switch

There is a main power harness that goes directly to the battery. There are a few loose wires in the main harness, the red one powers the injectors and fuel pump, which should be ran to the car side of the cut-off switch.
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Old 05-04-2014, 06:47 PM   #8
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Default Re: Holley and cut off switch

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There is a main power harness that goes directly to the battery. There are a few loose wires in the main harness, the red one powers the injectors and fuel pump, which should be ran to the car side of the cut-off switch.
Thats kinda the way I am thinking. The tech guys around here like to verify our shutoffs actually work and the alternator wont keep things going,I just dont want to screw up the tune or reset the ECU each time.
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Old 05-04-2014, 06:50 PM   #9
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Default Re: Holley and cut off switch

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Originally Posted by highpockets View Post
If you were to wire it to the cutoff side, would it be necessary to perform the TPS learn when power was cut?
No, the TPS AutoSet is stored in the ECU. Wire it as instructed in post #2.
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Old 05-04-2014, 07:48 PM   #10
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Default Re: Holley and cut off switch

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Originally Posted by highpockets View Post
Thats kinda the way I am thinking. The tech guys around here like to verify our shutoffs actually work and the alternator wont keep things going,I just dont want to screw up the tune or reset the ECU each time.
If you have EFI and an electric fuel pump it is sooooooo easy to wire this correctly! The alternator will not keep the engine running, just use a disconnect switch with two sets of contacts. Large set for the main power disconnect, small set to kill the electric fuel pump relay (can also ground the points input of the typical CD type of box.)

I wish we could make a sticky in this section to explain how to do this. Seems like once a month I type the same thing over and over and over................
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Old 05-05-2014, 04:21 AM   #11
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Default Re: Holley and cut off switch

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Originally Posted by Mike Beck View Post
Quote:
Originally Posted by highpockets View Post
That's kinda the way I am thinking. The tech guys around here like to verify our shutoffs actually work and the alternator won't keep things going. I just don't want to screw up the tune or reset the ECU each time.
If you have EFI and an electric fuel pump, it's sooooooo easy to wire this correctly! The alternator will not keep the engine running, just use a disconnect switch with two sets of contacts. Large set for the main power disconnect, small set to kill the electric fuel pump relay (can also ground the points input of the typical CD type of box.)
A conventional cut-off switch works fine.
The Holley 558-308 Main Power Harness should be wired directly to the battery terminals.
The switched red/white wire should be wired the the ignition key, then to the cut-off switch.
The 14 AWG red wire (system relay) should be wired to the cut-off switch.
When turning off the rear cut-off switch, the engine dies, no matter what.
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Old 05-05-2014, 05:54 AM   #12
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Default Re: Holley and cut off switch

Quote:
Originally Posted by Mike Beck View Post
Just use a disconnect switch with two sets of contacts. Large set for the main power disconnect, small set to kill the electric fuel pump relay...
Quote:
Originally Posted by Danny Cabral View Post
A conventional cut-off switch works fine.
On second thought, your dual contact cut-off switch is a cleaner way of doing it.
It may cost more, but there won't be large and small gauge wires under one terminal.
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Old 05-05-2014, 10:09 AM   #13
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Default Re: Holley and cut off switch

The dual-pole switch makes things so darn easy.
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Old 05-06-2014, 01:09 AM   #14
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Default Re: Holley and cut off switch

per NHRA Rules it has to be to the cut off switch...not directly to the battery...

I have run mine to the cut of switch for a few years with no issues.
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Old 05-06-2014, 01:14 AM   #15
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Default Re: Holley and cut off switch

so you are saying they don't want the Holley Wired to a junction Block distributor which is the first stop for power. This is how I was planning on doing mine, but is there really a problem with doing it this way?
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