Fuse/power block

While doing some wiring I had to access the Power Relay 4. The outputs on the other side of the block were not intuitive. I purchased a fuse block on Ebay for $9 so I could map the pinouts.

The outputs: C3-1: PR3 output. C3-2: A3 output. C4-1: PR1 output. C4-2: B6 output. C5-1: B5 output. C5-2: PR2 output. C6-1: A4 output. C6-2: PR4 output. C7-1: A2 output. C7-2: Not used. C7-3: B2 output. C7-4: B1 output. C8-1: Not used. C8-2: A7 output. C8-3: B8 output. C8-4: B7 output. The inputs: C9-1: PR4 trigger+. C9-2: PR2,3,4 trigger-. C9-3: Not used. C9-4: PR2,3,4 trigger-. C9-5: Not used. C9-6: PR2,3 trigger+. C9-7: PR1 trigger-. (the PR1 trigger+ is tied high) C9-8: PR2,3 trigger+.

This is the part you see when you remove the dash panel. This is the output side of the fuse/power block.

Normal disclaimer: This applies to my 2004 Volvo VNL780. Your truck may vary.