[Got Boost]

I need a 12v source from the transmission harness to trigger a relay to my trans cooler. Anyone know which sensor or wire I could use, I know its a long shot. FYI I have a TH400 so harness isn't being used folks.

 

[Harley#356]

Why do you need it to be from the trans harness?

One of these would do exactly what ya need lol

 

[MISTERgadget]

"I need a wire from the transmission harness, but the harness isn't being used"

huh? :smt100

 

[Thegoon]

"I need a wire from the transmission harness, but the harness isn't being used"

huh? :smt100

i think he is saying the harness isnt being used because he has a turbo 400. so the harness is an "extra"! Seems pretty far away just to grab 12v.

 

[Got Boost]

My trans cooler is mounted to the x-brace in the back of the truck. Need a 12v source to trigger the relay so when I start truck fan automatically come on. My trans harness is near my front bracket to my long bars.

 

[singlemalt]

Pretty simple: carefully tap your fuel pump positive wire. If it's going to a relay you will be fine. Be sure to use a good ground. Even when the pumps are not operating at full voltage you will have 12v at your relay with a chassis ground.

Enjoy!

 

[Got Boost]

Pretty simple: carefully tap your fuel pump positive wire. If it's going to a relay you will be fine. Be sure to use a good ground. Even when the pumps are not operating at full voltage you will have 12v at your relay with a chassis ground.

Enjoy!

Not being smart but is it smart to touch a line that powers the fuel pump? Wont that take away voltage from my pump (I have single pump).

 

[singlemalt]

If you are not using a factory pump setup, I would shy away from this... Unless you know what your current draw is and know that it's sized correctly for the wire.

Let me pull a diagram and see what I can come up with.

 

[singlemalt]

Where is your power source for the trans cooler? I want to make sure I understand your setup completely. I have a few ideas...

 

[singlemalt]

Tap the violet/white wire going to the trans. It's power for the 4R100 solenoids.

Another GREAT option (already relayed and set up for 30A current) is to tap the red wire going to the trailer pigtail.

 

[Blainer]

Do you want it to come on after you go to on, start and back to on?