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Relays or Switches with Breakers

Old 09-05-2014, 11:49 AM
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Default Relays or Switches with Breakers

My Son-in-Law and I are to the point of creating / modifying the electrical harness for his '86 Foxbody Mustang. It is to be a streetable drag car.

For all of the electronics (fans, ignition, start [well that will have a relay], pumps, lights, turn signals, nitrous run and purge):

Pros and Cons, with opinions between
1) running full current switches with circuit breakers to each of the above vs
2) running fused relays to each circuit with control-only current to the switch panel.

If we were to run with relays, should we put in 1 panel for all the front stuff, and 1 panel for all the rear stuff?
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Old 09-05-2014, 03:30 PM
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Relays for everything with circuit breakers.

Or use a digital power management system.
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Old 09-05-2014, 04:05 PM
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Attached Thumbnails Relays or Switches with Breakers-crusher.jpg   Relays or Switches with Breakers-motec%2520pdm30%2520top%2520label%2520actual%2520size.jpg   Relays or Switches with Breakers-monitor%2520pdm2.jpg  
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Old 09-05-2014, 08:59 PM
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Joe, I'm gonna say that is some nice stuff, but a bit out of his price range. I'm sure he'll love the pic, though. Very well done. I suppose this is "Crusher"?

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Old 09-05-2014, 09:47 PM
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Originally Posted by DNMakinson View Post
Joe, I'm gonna say that is some nice stuff, but a bit out of his price range. I'm sure he'll love the pic, though. Very well done. I suppose this is "Crusher"?
'Tis Crusher. And while I wish I could take credit, all I did on that car was some of the ECU work- the basics of the power system were all done before I got my hands on it.

And understood about the price. I guess at the rate that car probably eats transmissions, there's not a lot of money left over.

(bazinga.)


Switches vs. Relays... The OEMs like relays because it allows them to design small switches with a very light feel, and minimize the amount of heavy-gauge wire that has to be run.

Personally, I'm a big fan of simplicity. If there aren't a lot of circuits that need to be controlled, and the budget does not allow for anything more complex, I'd personally elect to just run full-current toggle switches and an off-the-shelf fusebox / distribution panel. I see no advantage to adding extra complexity and wiring by inserting relays in the middle of everything.
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Old 01-24-2015, 04:59 PM
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Default System Purchased, not yet installed

He went with a relay system by Race Wire Solutions, that was custom set up for his needs. I think he put more $$ into it than I thought he would.


System, not installed


Close-up of relay bank


Remote switches mounted to top of roll cage for easy reach.
Attached Thumbnails Relays or Switches with Breakers-img_1359.jpg   Relays or Switches with Breakers-img_1358.jpg   Relays or Switches with Breakers-img_1355.jpg  
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