3 Fan Relay + VA - Diagram

[TA_C10]

Originally Posted by nsb29

If you are running three relays so that you will have high speed low speed you’re trinary switch only needs to trigger fan 2 which would turn both fans on high. ??

Yo, NSB29, I just read your post again, didn't see your question/suggestion under the pic the first time. Anyways.... At first I thought you may be right, but then I went over my diagram and if you follow the current flow and grounding I think if you only excite the high speed fan relay(ground), your going to get ground/power all the way through the circuit up to "relay 1 - 87". But because bosch style 5pin relays are "87a normally closed" you would need excitement through 85 and 86 to flip the switch from 87a to 87 which would then open up the current from pin 30 to 87. So your only going to get the high side fan to run by itself full speed.

Am I thinking correctly here guys? I'm not at a point where I am ready to hook a battery up yet, but very close, so I will test this theory very soon unless ya'll can confirm my thought.