wiring in rear mount trans cooler
Thread Starter
Teching In
Joined: Nov 2016
Posts: 11
Likes: 1
wiring in rear mount trans cooler As the title says Im needing some help with wiring in my trans cooler.
Ive got a 98 WS6 and Im finishing up the 4l80e swap car was originally a 6spd. Ive got my trans cooler mounted in the rear of the car under the Ttop storage. Ive got a fan mounted to be a puller. i dont want to run the a toggle switch in the car. Is there a power source in the rear of the car i can tap into that will have my fan kick on when the car is started and shut off the fan once the car is off? would tapping into the antenna work? I don't use the radio since my phone is plugged in.
thanks for any info and help.
Ive got a 98 WS6 and Im finishing up the 4l80e swap car was originally a 6spd. Ive got my trans cooler mounted in the rear of the car under the Ttop storage. Ive got a fan mounted to be a puller. i dont want to run the a toggle switch in the car. Is there a power source in the rear of the car i can tap into that will have my fan kick on when the car is started and shut off the fan once the car is off? would tapping into the antenna work? I don't use the radio since my phone is plugged in.
thanks for any info and help.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
If you did have the battery in the trunk you could wire the battery to a relay to power the fan. The "signal" to turn on the relay could come from the fuel pump.
No, you cannot run the fan on the same circuit as the fuel pump because the wiring to the fuel pump is already marginal and you cannot double the amount of power through it.
A fuel pump typically takes 10 Amps. Your fan probably takes at least 10 Amps.
Tell us how many amps your fan pulls and that might help us guide you in a good direction.
No, you cannot run the fan on the same circuit as the fuel pump because the wiring to the fuel pump is already marginal and you cannot double the amount of power through it.
A fuel pump typically takes 10 Amps. Your fan probably takes at least 10 Amps.
Tell us how many amps your fan pulls and that might help us guide you in a good direction.
Thread Starter
Teching In
Joined: Nov 2016
Posts: 11
Likes: 1
If you did have the battery in the trunk you could wire the battery to a relay to power the fan. The "signal" to turn on the relay could come from the fuel pump.
No, you cannot run the fan on the same circuit as the fuel pump because the wiring to the fuel pump is already marginal and you cannot double the amount of power through it.
A fuel pump typically takes 10 Amps. Your fan probably takes at least 10 Amps.
Tell us how many amps your fan pulls and that might help us guide you in a good direction.
No, you cannot run the fan on the same circuit as the fuel pump because the wiring to the fuel pump is already marginal and you cannot double the amount of power through it.
A fuel pump typically takes 10 Amps. Your fan probably takes at least 10 Amps.
Tell us how many amps your fan pulls and that might help us guide you in a good direction.
I wasn't planning on splicing into the fuel pump. I was gonna use the Key switch wire to the power antenna to run the fan. It would stay on until the door is opened or after a certain time it shuts off. Would that be a decent power source to run the fan?
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
I tend to over-wire things, but IMHO a dedicated 12 Gauge or even 14 should be plenty big.
Here is a useful chart showing wire gauge sizes needed in Cars/Boats depending upon amperage and wire length, while allowing either a 3% or 10% voltage drop.
IMHO a 10% voltage drop to a fan which only runs when the engine is running is fine.
https://www.bluesea.com/resources/1437
Here is a useful chart showing wire gauge sizes needed in Cars/Boats depending upon amperage and wire length, while allowing either a 3% or 10% voltage drop.
IMHO a 10% voltage drop to a fan which only runs when the engine is running is fine.
https://www.bluesea.com/resources/1437
