Vendors have the diodes.
SOBill's list shows fan diodes as:
http://www.nteinc.com/ Diode NTE5940 rated at 50V and 15A diodes for isolating fans
Diodes on 2511 have the red merriah wire attached to the chassis (ground) with the black merriah wires running through the diodes to the harness wiring. My diodes are mounted in holes drilled in the fan support structure with fiber insulators to isolate them from the chassis grounded system.
Larry
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