where would I tap into for 12v

[sscamino]

Where can I tap into for 12v power for an B&M trans cooler and fan?

 

[Phoneguy]

I wouldnt tap anything, just run a new wire to the fuse box and connect to an IGN switched terminal

 

[notacarlo]

I wouldnt tap anything, just run a new wire to the fuse box and connect to an IGN switched terminal

strongly agree.

There are a couple of unused IGN (12v switched) in the panel.

 

[Nick Micale]

I wouldnt tap anything, just run a new wire to the fuse box and connect to an IGN switched terminal

The fuse box terminal could be used to energize a relay to power the fan, do not think it would be wise to power the fan from it?

 

[SSedan64]

The fuse box terminal could be used to energize a relay to power the fan, do not think it would be wise to power the fan from it?

I agee ^^^, the amp load these pull can be quite high especially at startup.

 

[sscamino]

12v pick up

If not fuse box, where then?

 

[Just a Six??]

back of alt to a relay is how many do it.

 

[SSedan64]

Battery Quick connects work well also. For side or top Post terminals.
Pilot Automotive/Quick connect side post battery terminal (MS-036) | Battery Terminal End and Adapter | AutoZone.com

Or long side post adapter
Tsunami/Long battery side post adapter (BT306L) | Battery Terminal End and Adapter | AutoZone.com

Long bolt adapter Pic here
Mark VIII Fan Install in a 1972 Chevy C10 Truck