Re: To relay or not to relay
[Re: HemiDart68]
#664324
04/08/10 10:34 AM
04/08/10 10:34 AM
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Joined: Dec 2007
Posts: 10,542 BROOK PARK, OH
WILD BILL
Senior Member of the Junior Dragster Club
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Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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I have relays on everything
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Post deleted by Defbob
[Re: Stanton]
#664327
04/08/10 02:53 PM
04/08/10 02:53 PM
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Anonymous
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Anonymous
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Re: To relay or not to relay
#664328
04/08/10 03:12 PM
04/08/10 03:12 PM
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Joined: Oct 2005
Posts: 8,908 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,908
Ontario, Canada
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Quote:
no relays fan,water or fuel pump,anywhere here. step up one wire size and use a 40 or 50 amp switch
That's ridiculous ! It would be like running power thoughout your house right from the transformer - with no breaker panel !!! When something shorts it just burns your house down.
Same applies to the car. So instead of blowing a cheap fuse the pump overloads, melts the insulation off the wire, shorts to the chassis and blows up you battery or lights the whole thing up.!
What some guys do to save a few bucks !!!!
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Re: To relay or not to relay
[Re: Stanton]
#664329
04/08/10 03:15 PM
04/08/10 03:15 PM
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Anonymous
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Quote:
Quote:
no relays fan,water or fuel pump,anywhere here. step up one wire size and use a 40 or 50 amp switch
That's ridiculous ! It would be like running power thoughout your house right from the transformer - with no breaker panel !!! When something shorts it just burns your house down.
Same applies to the car. So instead of blowing a cheap fuse the pump overloads, melts the insulation off the wire, shorts to the chassis and blows up you battery or lights the whole thing up.!
What some guys do to save a few bucks !!!!
Stanton, you are absolutely CORRECT. i use the magnafuel dual relay on my magnafuel 500 fuel pump. and dual on my product engineering fuel pump. i also run relays on my water pump and electric fan, if something shorts out, your going to fry something if theres no relay.
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Re: To relay or not to relay
#664330
04/08/10 03:38 PM
04/08/10 03:38 PM
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Joined: Jan 2004
Posts: 4,866 North of Detroit
HemiDart68
master
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master
Joined: Jan 2004
Posts: 4,866
North of Detroit
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Fred didn't say he doesn't uses fuses, just no relays. He is correct relays save switches. If you do use a high quality enough of a switch you can get away without a relay.
In God we trust, all others pay cash.
www.lightnens.com (Home of the world's fastest Paint Job)
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Re: To relay or not to relay
[Re: HemiDart68]
#664331
04/08/10 04:07 PM
04/08/10 04:07 PM
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Joined: Aug 2003
Posts: 43,292 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,292
Bend,OR USA
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I now use fuses and relays were ever possible, saves on the big gauge wire runs.
Last edited by Cab_Burge; 04/08/10 04:20 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: To relay or not to relay
#664332
04/08/10 04:19 PM
04/08/10 04:19 PM
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Joined: Jul 2008
Posts: 610 Boise
Moparteacher
mopar
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mopar
Joined: Jul 2008
Posts: 610
Boise
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No relays! More than sufficient assuming all is fused.
Relays don't protect the circuit. Relays are not protective devices. Fuses, circuit breakers, fused links, and PTC's are protective devices.
If the conductor is large enough to handle the current and the switch is designed to handle the current, and the circuit is fused, then it's not a flawed circuit.
Afterall, the relay is simply a electromagnetic switch.
Last edited by Moparteacher; 04/08/10 04:20 PM.
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Re: To relay or not to relay
[Re: Moparteacher]
#664333
04/08/10 04:31 PM
04/08/10 04:31 PM
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Joined: Apr 2005
Posts: 1,880 USA
Ron Silva
top fuel
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top fuel
Joined: Apr 2005
Posts: 1,880
USA
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Relays are not required. Period.
But in this case, on my Car, I used a relay to shorten the run of heavy ga wire. Since the toggle and control of the pump is in the front of my car and the battery is in the back. I used a very short run of 10 ga wire from the battery to a fuse and then through the relay to the pump. Then I used an 18 ga wire from the cars original fuse panel to the toggle sw and to the relay in the back of the car.
SRT DEMON ONE SEAT
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Re: To relay or not to relay
[Re: HemiDart68]
#664335
04/08/10 05:10 PM
04/08/10 05:10 PM
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Joined: Oct 2005
Posts: 8,908 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,908
Ontario, Canada
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Quote:
Fred didn't say he doesn't uses fuses, just no relays.
Yep, good point!
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Post deleted by Defbob
[Re: HemiDart68]
#664336
04/08/10 05:12 PM
04/08/10 05:12 PM
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Anonymous
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Anonymous
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Re: To relay or not to relay
[Re: PARTSMAN440]
#664338
04/08/10 07:06 PM
04/08/10 07:06 PM
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Anonymous
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Anonymous
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just to clarify it. i run fuses as well as relays. everything is also run with weatherpack connectors for easy installation and removal.
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383man
#664340
04/08/10 07:37 PM
04/08/10 07:37 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Any circuit should be protected with fuses or circuit breakers or fuseable links. It dont matter if you use a relay you still need to protect the circuit with a fuse or equivalent. The best I can think of is to think about a starter relay. Now if you had a switch to handle 200 to 400 amps would you still want to run battery cable size wire up in the dash to the ign switch ??? No of course not ! Thats why you use a starter relay so it can handle the heavy load and keep the large starter cable wire under the hood. I used a relay for my electric fan I installed on my 63 but I could have done it without one. This way I just use 18 gauge wire to the switch that works the relay and then I used 14 gauge wire to the relay. Both circuits are protected which are the relay coil circuit from the switch which is on a 10 amp fuse and the load carrying wire that goes to the relay contacts which is protected by a 30 amp fuse. Its just a matter of the circuits being run and the load the circuit will carry. I have always said that the Japanese cars use way to many relays as they take a simple circuit that needs one relay and end up having 3 relays in it. Ron
Last edited by 383man; 04/08/10 07:42 PM.
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