2001 V8 how to jump relays to run radi cooling fans constant

[coltswalker]

I have a 2001 L47 V8 Aurora and I want to modify it for diagnostic purposes to that both radiator cooling fans turn on at high speed with the ignition. From what I understand the configuration uses multiple relays to run the fans at slow speed in a series circuit or high speed in a parallel circuit, if this is correct. I would like to jumper one or more relays so the fans run continuous at high speed, again, for testing purposes. I would like to drive it like this for awhile an monitor operating temperature.

Has anyone performed this modification? Which relays should be jumped?

I realize that pulling the temp sensor causes the fans to run, however, the inability to monitor temperature from the dash is undesirable.  The temperature must continue to be read by the computer while the fans run constant.

[Toronado3800]

Would it be acceptable to just unplug the fans and put a relay and fuse in line between positive hot and the fans? Controlled by a switch in the car of course.

I favor a relay because of the current I assume is involved.

[tigger]

Oh that's gonna be a PITA trying to jump relay pins! The circuits are hot at all times (PCM provides grounds) so you'd have to wire in a switch somewhere or it would run all the time, haha!

Probably easier to just T-tap the low and high speed control wires at the PCM then trip the low speed fans (as in turn on the A/C or unplug the coolant level sensor).