Manual Fan Switch 86 relay to....? - Chevy Impala SS Forum
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post #1 of 4 (permalink) Old 11-22-2017, 04:00 AM Thread Starter
NoobDaily's Avatar
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Location: Compton
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Manual Fan Switch 86 relay to....?

Kk guys, after summing up the cojones to attack this manual fan switch I still need some help... I read a great right up 4doorss wrote years ago; however, I am still stumped at one point... Sorry I'm horrible with wiring as I overcomplicate things, but I need to learn....

Ok so the picture shows everything being routed to the relay no prob... My only thing is when it comes down to the toggle switch.. Do I route the cable leading from the relay # 86 which is power out to the supply volts on the toggle switch or the accessory? And if it leads to the supply volts on the toggle switch, what do I connect the accessory to? Vice versa if the case was switched around. Let me know if I can make my self more clear thanks!!
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Last edited by NoobDaily; 11-22-2017 at 04:16 AM.
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post #2 of 4 (permalink) Old 11-22-2017, 03:33 PM
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I would wire the switch to ground the relay, not power it. Since you are using a switch, you can use a hot in run/test/acc. wire, and you can leave the switch on, unless you want to turn it off. You can also use an always hot wire. Make sure you fuse the circuit. You could even connect it directly to the battery with a fuse, but you must remember to turn it off when you stop the car. If you are going to ground the relay with the switch, you can use the same hot wire to power both the coil, and hot input of the relay. Check the wattage of the fan, and use an appropriate size wire, and fuse. You could also use the hot in run/test/acc. to power the coil, and connect the power for the fan directly to the battery with an appropriate fuse.

Red and black is usually a hot in run/test/acc. It is a small gauge wire, so do not use it for the main power for the fan.

I am not sure why you are putting a lead to the PCM. If you are going manual, you do not need anything from the PCM.

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Last edited by Fred Kiehl; 11-22-2017 at 03:39 PM.
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post #3 of 4 (permalink) Old 11-23-2017, 12:19 AM Thread Starter
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Hey Fred, thanks for the reply and happy thanks giving! I ended up routing the cables as 4doorss had mentioned years ago and worked like a charm. Just had to play with the ground and the wire going to the toggle switch from the relay and boom. Ended up working! Thank you for the help Fred.
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post #4 of 4 (permalink) Old 11-23-2017, 09:20 AM
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Sounds like you got if figured out and not sure what diagram I may have provided cause I never wired up my fans manually before. Unless you may have used the relay in a similar fashion to how I wired up a fuel cutoff? I wired up that relay so that the only time it would be energized was when I wanted to disable the fuel pump. Normally it is just along for the ride and does not draw any amperage at all.

In any case, glad whatever it was helped you get yours figured out. Just as an FYI for others looking to do this or if you may want to tackle this a different way. Gary at Innovative wiring offers a ready made kit to control your fans manually.....

Caprice / Impala SS / Roadmaster | Innovative Wiring LLC

...sure it may cost you some money but just look at what you get. You may need to scroll down his page to find the specific kit that fits your needs/budget cause he has a few there. But for certain you can be assured his stuff is top notch and will work very well.

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'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to never ends.
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