Connecting Fan 2 Wiring to Auto/On/Off Switch

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SUMMARY

This discussion focuses on connecting FAN 2 Wiring (673 DKBLU) to the Auto pole of an AUTO/ON/OFF switch for manual fan activation. The user seeks clarification on the relay's negative connection, noting that the fan relays are grounded by the Powertrain Control Module (PCM). The proposed wiring involves connecting A10 to the AUTO side of the switch, grounding the ON side, and feeding the negative side of the coil. This wiring configuration is confirmed as correct by other participants in the discussion.

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  • Understanding of automotive electrical systems
  • Familiarity with relay wiring and operation
  • Knowledge of Powertrain Control Module (PCM) functions
  • Basic skills in handling automotive switches and circuits
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  • Research automotive relay wiring diagrams
  • Learn about Powertrain Control Module (PCM) grounding techniques
  • Explore the functionality of AUTO/ON/OFF switches in automotive applications
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Automotive technicians, electrical engineers, and DIY enthusiasts looking to understand fan wiring and relay configurations in vehicles.

layzurguy
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24094d1171762218-does-anyone-have-electric-fan-relay-diagram-auto-fan-wiring.gif


fan_schematic_1995.jpg


What I'm tring to do is connect FAN 2 Wiring (673 DKBLU 2nd picture top diagram) to
The Auto pole of the AUTO/ON/OFF switch so I can manually activate the FAN if needed.

I'm a little confused since in the 2nd pic, I don't see a Negative side to the coil on the relay.
Can/will this work?
 
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The fan relays are "grounded" by the PCM. In other words, A10 and A11 are working like switches that connect the relays to the negative side of your source.
 
So...
I would connect:
A10 to the AUTO side of the switch
Ground to the ON side of the switch
The feed lead to the Negative side of the Coil

Is this correct?
 
Yes. That's the way it looks to me.
 

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