All,
I have been struggling with troubleshooting my IC Pump problem. It's not the normal failed pump or fuse problem.

Symptoms

• The symptoms are identical to the IC Pump problem (have had this before and fixed it - I inadvertently caused this when I tested autocrossing it with the traction control disabled at the electrical block by the battery)
• When the car gets hot, after 3-4 pulls, the super charger stops engaging
• Pump is not on when car runs, even when hot, even when RPMS come above 2000

The Problem is Not

• The Pump
• The Impeller
• The ground
• The Fuse

I Know Because I Have Tested

• Connected a jumper wire directly to the battery to manually get power to the pump. When I do this, I can drive the car all day long and the SC never cuts out. As soon, as I disconnect the jumper wire, the water gets hot and the SC cuts out within three hard pulls. Happens like clockwork [1].
• Have done the relay jumper always on mod [4]. Wired pins 2 and 7 together on the N65 block, which causes the pump to come on and operate when the key is in the on position.
• Have logged intake air temps. The SC cuts out at ~205F and will come back on when intake air temps drop below `185F. With the pump hard wired, or the relay always on mod, the intake air temps are pegged at ~120F, which is exactly as expected if the pump is working and the impeller is in tact.
• Have done (temporarily) the fuse always on mod [2] (doesn't work because it's the relay).
• Have connected a 2 amp charger directly to the IC Pump wires and the pump comes on and pumps water when I squeeze hose (so I know the pump is good. Video for good measure [3].
• Tested power on both sides of fuse 13 (IC Pump fuse), so I know power is getting through the fuse, getting 14 volts on both sides of the fuse (also did the mod above just to make sure)
• Changed the fuse just to make sure
• Tried revving car about 2000 RPMs for a while to try and get the pump to come on
• Have been feeling the pump with my hand (so I am definitely sure when it is coming on and not coming on)

Open Questions

• Could it be the relay on the PBU?
• Should I take it to the dealership to try and troubleshoot? (I fear they will not come to the right conclusion)
• Should I just run a separate circuit to the pump?
• Has anybody else had this problem?
• How the heck do I test the relay?

Other Notes

• The IC pump is a Johnson CM30 and it is working fine [1]

Next Step

• Figure out how to replace the relay

I'm open to any and all ideas. My brain hurts, never seen this one before :-)

[1]: https://www.dropbox.com/sh/0p9r9m8ov...fa8flFvEa?dl=0
[2]: [3]: [4]: https://www.crossfireforum.org/forum...-question.html