Relay wiring for an fan

mountainview68 · Apr 5, 2007

I went to napa and bought a relay to activate the fan on my transmission cooler. I have not wired one before and there is no instructions. This is a standard relay. I have 5 pins labeled 85, 86, 87, 87a, and 30. Does anyone know what connects to what. The guy at napa had no idea.

Thanks

JWMcCrary · Apr 5, 2007

From memory here, but I believe this is correct. I have never used the pin in the center, I believe it is 87A.

Pin 30 - Hot from Battery
Pin 85 - Ground
Pin 86 - From switch to activate relay 12V
Pin 87 - out to fan (12V when relay is on)

You might wait for somebody else to verify this or correct.

70_Steve · Apr 5, 2007

See if this helps. Or, do a Google search for Bosch relay wiring.

JWMcCrary · Apr 5, 2007

70Steve's drawing verifys what I posted...good luck.

ugly74 · Apr 5, 2007

most relays I've seen have a schematic cast into one side.

mountainview68 · Apr 5, 2007

Thanks, that helps alot. My relay does'nt have anything printed on it.

Gummi Bear · Apr 5, 2007

I hope you bought a 80 amp relay. Those fans pull a lot of juice, a 30A relay won't last one day.

Ryans71 · Apr 5, 2007

I even had an 80 go out. So I switched to a constant duty selonoid. Haven't had a problem since.

Ryan.

JWMcCrary · Apr 5, 2007

Gummi Bear said:
I hope you bought a 80 amp relay. Those fans pull a lot of juice, a 30A relay won't last one day.

SHouldn't be a problem for the fan on a trans cooler. My B&M trans cooler calls for a 15 amp fuse.

mustangmarty · Mar 19, 2010

I'm about to wire up my Tranny cooler fan and want to go the constant duty solenoid route.

Does anyone know a part number or application that I should ask for at the parts store?

Also, the cooler itself has a couple wires coming of of it. I'm assuming that is for an internal thermostat that tells the fan when to turn on and turn off. Am I correct? And how do I wire that up?

I don't have the box or paperwork or instructions anymore. Lost them years ago and only now getting to install it.

Marty

Ryans71 said:
I even had an 80 go out. So I switched to a constant duty selonoid. Haven't had a problem since.

Ryan.

DirtDonk · Mar 19, 2010

Not necessarily for a thermostat, though it could be. Lots of motors have a power and a ground wire.
Did any diagrams come with the fan at all?

Paul

DanWheeler · Mar 19, 2010

geez, what kinds of fans are you guys running? 30 amp should be plenty for a trans cooler fan.

DirtDonk · Mar 19, 2010

They're talking about the main cooling fans like the Taurus swap. They pull big amps when just starting up. I think the 6-cyl Mustang uses a 60 amp maxi-fuse to protect the circuit.

Paul

mustangmarty · Mar 19, 2010

I'm sure it did at one time. But that was MANY moons ago! The cooler has the fan already mounted to it and it has it's own two wires. One for power and one for ground. However, the cooler itself also has what looks like a sending unit built in with two electrical leads for blade-type plugs. That is what I'm assuming is a thermostatic switch for the fan.

DirtDonk said:
Not necessarily for a thermostat, though it could be. Lots of motors have a power and a ground wire.
Did any diagrams come with the fan at all?

Paul

rsharpnm · Mar 19, 2010

As a long-retired NAPA counterperson, I am saddened by the ignorance of your counterperson. He/she should seek a more lucrative career in the fast-food industry.

And just to be a poopy-head, I've run a 30A relay on my Taurus fan for five years now. No problem... probably due to the fact that I only use it to switch to manual 'high-speed' position, when the fan's already spinning at low speed via the automatic sensor (and separate relay). Lower amp draw when it's already turning.

Relay wiring for an fan

mountainview68

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