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Unread 09-18-2011, 11:20 AM   #1
Unlimited04
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Check my accessory wiring diagram

I suck at wiring...I want to run an electric fan. I want it to kick on with a thermostatic switch, or turn on when I flip a dash switch, or be off completely for water crossings, etc.

I was looking at a few wiring diagrams online, and came up with the following options:


Using two relays I came up with this idea, using a DPDT switch.


I could see using a DPDT switch to energize either the t-stat or an always on with one single relay...but would I need a diode here to prevent current traveling back to the t-stat?

I'm not sure i've got the DPDT wired right. Any suggestions?

Also, using a SPST switch...I found this on Summit Racing:


So will this work? Will I need a diode to prevent current flow back along the non-active pathway?

Thanks

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Unread 09-18-2011, 02:32 PM   #2
Carl48
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Using a single relay as in the last schematic, come off of the 85 relay terminal to the arm of a SPDT switch (which has a center "off" position). Wire one side of the SPDT switch directly to ground and the other side of the SPDT switch to ground via the thermostat. In one position, the fan will come on; in the other position, the fan will be controlled by the thermostat; and in the center position, the fan will always be off.
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Unread 09-18-2011, 02:58 PM   #3
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Quote:
Originally Posted by Carl48 View Post
Using a single relay as in the last schematic, come off of the 85 relay terminal to the arm of a SPDT switch (which has a center "off" position). Wire one side of the SPDT switch directly to ground and the other side of the SPDT switch to ground via the thermostat. In one position, the fan will come on; in the other position, the fan will be controlled by the thermostat; and in the center position, the fan will always be off.
got a diagram? I'm not visualizing.
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Unread 09-18-2011, 03:58 PM   #4
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like this?
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Unread 09-19-2011, 02:43 AM   #5
Carl48
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That should work if you have a two wire thermostat.
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Unread 09-19-2011, 06:47 AM   #6
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Quote:
Originally Posted by Carl48 View Post
That should work if you have a two wire thermostat.
Thanks! I'll give it a try.
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Unread 09-19-2011, 09:58 AM   #7
Carl48
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btw..be aware that usually the mechanical action of a SPDT (single pole double throw) toggle switch is such that with the switch handle in the upper position there will be continuity between the center and lower switch terminals and with the switch handle in the lower position there will be continuity between the center and upper switch terminals. Not a big deal...just something to be aware of in case the switch action is opposite of what you intended. Let us know how things worked out.
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