Dual Fans - Vintage Air - ProFlo-4 ECU

[C10forDad]

Originally Posted by PbFut

Looks correct. You did not show the connection to the ecu from trinary/vintage air +12v to let the programing know there is an additional load of the compressor. Most efi systems have a sensor wire to look for +12v signal when the compressor is running. It triggers a tuning modification to adjust the IAC valve, timing, and RPM. Normally all configurable in the software. This allows compressor cycling with little to no noticable affect on engine idel.

Thanks!

The Vintage Air wiring harness from its ECU has its own relay that supplies a +12V signal to the black/green wire on trinary safety switch.

I could not find any information stating that the ProFlo-4 has the ability to sense the load the A/C compressor.
However, these systems do have the ability to learn and adapt to different loads quickly.

I am also using a Dakota Digital instrument cluster with a BIM so that all ECUs can work together and display accurately on the gauges.

Edit: I added to the diagram the following items

1. a fused distribution block
2. changed power supply to relays 2 and 3 that are only powering another relay
3. Vintage Air ECU
4. Vintage Air Compressor Relay to Trinary Safety Switch