Can Diodes be Used To Connect Two Power Sources To A Radiator Fan

Published 11/06/2023

Products Featured in This Question

Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 4-Way Flat Connectors

(3392)

$86.90

Roadmaster Hy-Power Diode - (Qty 1)

(350)

$19.65

Question:

Hi I was wondering if this has been used before on a Car Electrical Radiator Fan. To connect 2 different power sources into the same fan motor... The stock car ECU and a separate power switch Dakota Digital... I was looking at this Roadmaster Hy-Power Diode - Qty 1 Item # RM-790. The fan max Amp is about 30-40. at 12-14V DC.

asked by: Martin A

Expert Reply:

Diodes like the # RM-790 are just to prevent feedback by allowing electricity to only flow one way and wouldn't provide the same function as a transfer switch to go between the two power sources, if that's what your goal is. You would need a automotive grade relay with two trigger wires to separate the two power sources so that the fan can be triggered by the ECU at the set temperature and with your switch.

expert reply by: Kevin C