Secondary fan switch getting hot
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Senior Member
Joined: Oct 2005
Posts: 535
Likes: 1
From: Cincinnati, Ohio
Car: 1989 Iroc Z
Engine: 496 BBC
Transmission: th400
Axle/Gears: 4.11
Secondary fan switch getting hot
I have a toggle switch hooked up to my secondary fan and i've noticed that its getting warm, sometimes hot to touch. its a 3 wire toggle switch but i have the fan ground wire hooked up in the engine bay. So i only have the hot fan wire and the source wire from the fuse box. I also found out that if i hook the hot on one side of the fuse it will blow it but it wont on the battery side of the fuse. Its a 15 amp fuse and the fan is supposed to draw only 12 amps. I used 14G wire so i thought it would be fine. Any help would be appreciated guys.. thanks
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Switch To The Cool Side
That’s because it’s not going to a relay.
Rewire the setup so it turns on the fan relay, not the fan directly.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
Rewire the setup so it turns on the fan relay, not the fan directly.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Make Noise, Turn Left, Repeat
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Make Noise, Turn Left, Repeat
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Last edited by NINÅ; Mar 10, 2010 at 12:31 PM.
Thread Starter
Senior Member
Joined: Oct 2005
Posts: 535
Likes: 1
From: Cincinnati, Ohio
Car: 1989 Iroc Z
Engine: 496 BBC
Transmission: th400
Axle/Gears: 4.11
Re: Switch To The Cool Side
Why would a relay matter? It still has to get power from somewhere and the switch is a 20amp
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Switch To The Cool Side
Why would a relay matter?
switch is a 20amp
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
How bout those too scared to drive without headlights in the daytime
and the ones that need headlights for a little rain
.
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How bout those too scared to drive without headlights in the daytime
and the ones that need headlights for a little rain.
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Joined: Jan 2004
Posts: 2,953
Likes: 372
From: Las Vegas
Car: 1987 Formula (original owner)
Engine: 305 TPI
Transmission: T5
Axle/Gears: 9-bolt/3.45
Re: Secondary fan switch getting hot
All you should work with is the fan switch's single green wire(ground wire)... no hot wires and no relays, as those are already connected. So if you're working with the hot wire, then, in effect, it's probably like having connected the power twice, thereby overloading the circuit.
Near the fan switch, splice a wire into the switch's single green wire; run the new wire into the car and connect it to one side of a two-prong toggle switch; wire the other prong to the metal dash frame... done. Flipping the switch completes the ground, turning on the fan.
It's that simple--really.
Near the fan switch, splice a wire into the switch's single green wire; run the new wire into the car and connect it to one side of a two-prong toggle switch; wire the other prong to the metal dash frame... done. Flipping the switch completes the ground, turning on the fan.
It's that simple--really.
Last edited by LAFireboyd; Mar 10, 2010 at 12:49 PM. Reason: clarity
Senior Member
Joined: Feb 2010
Posts: 1,125
Likes: 1
From: San Diego, California
Car: Trailblazer EXT 4.2 (Firebird Form)
Engine: 5.1 4bbl
Transmission: 700R4 Mega Raptor Level 4
Axle/Gears: 2.73
Re: Secondary fan switch getting hot
toggle switches are suppose to trigger a relay, not supply the power an accessory requires to function... 
Thread Starter
Senior Member
Joined: Oct 2005
Posts: 535
Likes: 1
From: Cincinnati, Ohio
Car: 1989 Iroc Z
Engine: 496 BBC
Transmission: th400
Axle/Gears: 4.11
Re: Secondary fan switch getting hot
All you should work with is the fan switch's single green wire(ground wire)... no hot wires and no relays, as those are already connected. So if you're working with the hot wire, then, in effect, it's probably like having connected the power twice, thereby overloading the circuit.
Near the fan switch, splice a wire into the switch's single green wire; run the new wire into the car and connect it to one side of a two-prong toggle switch; wire the other prong to the metal dash frame... done. Flipping the switch completes the ground, turning on the fan.
It's that simple--really.
Near the fan switch, splice a wire into the switch's single green wire; run the new wire into the car and connect it to one side of a two-prong toggle switch; wire the other prong to the metal dash frame... done. Flipping the switch completes the ground, turning on the fan.
It's that simple--really.
The hot wire coming off the fan goes to the toggle switch which receives its power from a wire coming from the fuse box to the toggle switch, its not getting power twice.
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Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Switch Fix
The hot wire coming off the fan goes to the toggle switch which receives its power from a wire coming from the fuse box to the toggle switch………
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◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
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If People Drove Any Slower They’d Be Going Backwards
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If People Drove Any Slower They’d Be Going Backwards.
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