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#1
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Do I still need a relay when using a thermal switch?
I am using this thermal switch for a fan on one of my fluid coolers: https://www.improvedracing.com/therm...00f-p-831.html
I'm so used to wiring up relays w/fuses to control electric fans (like for coolant radiators that draw 20+ amps), I didn't think that perhaps in the case of this thermal switch, that I may not need it. The fan I'm controlling only draws 7.2 amps, that switch is rated for 10 amps. Does this mean I don't need the relay in this case? I have a 25 amp continuous relay with a 30 amp fuse on hand, but if I can simplify my wiring, I'd like to. But on the other hand, if using a relay will make the strain easier on my electrical when it kicks on, then I'd rather go that route. Thanks!
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1969 Pontiac Firebird Last edited by 92GTA; 05-21-2020 at 12:57 PM. |
#2
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Use the thermal switch as the switch to turn the fan relay on.
You need the main power to go to the fan from the relay.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#3
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So wire it as normal with a relay. Understood.
Thanks!
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1969 Pontiac Firebird |
#4
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You don't need a relay. The current capability of the switch is higher than the load, so safe to use the sw without a relay.
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#5
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Quote:
Relays are cheap and easy to replace when their contacts get used up. Clay |
#6
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Quote:
Yes this is correct Sent from my iPhone using Tapatalk |
#7
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Derale doesn't publish those in their specs so I have no clue. Better safe than sorry then with the relay.
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1969 Pontiac Firebird |
#8
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You said you already have a relay check around as there are many ways to mount the relay individually or in a multi relay mounted application. I did this in my 70 Lemans and mounted the unit in the inner fender behind the battery. Very easy to get to and I really removed all electrical draw from the original harness to the relay box for the horn hi and low beam, AC compressor clutch, coil, starter solenoid and blower fan. I am really happy with it. It did take some time and a lot of thought and layout. I purchased the wire termination ends so I could cut the wires to the correct length and terminate them instead of multiple splices. Is it over kill? YES it is!
Good luck. |
#9
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Nice. I have all of mine attached to the top of my radiator support facing forward. Hidden and easy to get to by just removing that 1 metal closeout panel. I also have a dedicated body ground going to the radiator support for that reason.
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1969 Pontiac Firebird |
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