Electric radiator fans won't come on - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 45 (permalink) Old Aug 15th, 17, 1:06 PM Thread Starter
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Ethan
 
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Electric radiator fans won't come on

I bought the dreaded eBay slim fans to try them out and plan on using them for right now. Can't afford anything else right now. I also bought a relay kit on eBay as well. I wired it up like this. 16g brown wire from relay goes to 12v ignition source, 12g red wire goes to auxilliary side of the breaker, 16g black wire goes to temperature switch and the other 12g red wire goes to fans. And a 12g red wire from batt. side of breaker to pos. side of battery.

The slim fans right now are wired up 18g blue to ground and 18g spliced together to 12g red wire butt connector. I have done it vice-versa, too. 18g black to ground and 18g blue to power 12g red wire. Nothing. What am I doing wrong here?

Also, I had to use galvanized fitting for the temperature switch from the radiator, because I didn't have the proper 1/8"NPTM x 3/8"NPTF fitting at the time. Could the temperature switch not be grounding?

Please help! Do you need any photos?

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post #2 of 45 (permalink) Old Aug 15th, 17, 1:15 PM Thread Starter
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Ethan
 
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Re: Electric radiator fans won't come on

Don't mind the wiring mess. As soon as I can figure out what is going on, I can tidy everything up.

And it's a 60amp relay as well. These fans will probably pull no more than 8-10amps combined.
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post #3 of 45 (permalink) Old Aug 15th, 17, 1:24 PM Thread Starter
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Re: Electric radiator fans won't come on

And I get my engine temp up to 210*. No hotter and they still don't come on. I believe the temp switch makes the fans come on at 185* or 200*.

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post #4 of 45 (permalink) Old Aug 15th, 17, 1:54 PM
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Re: Electric radiator fans won't come on

It is hard to check your wiring from the pics but if you suspect the temperature switch, just pull the wire off of it and ground the wire to turn on the relay and fans.

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post #5 of 45 (permalink) Old Aug 15th, 17, 2:12 PM Thread Starter
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Re: Electric radiator fans won't come on

Quote:
Originally Posted by 69SS454 View Post
It is hard to check your wiring from the pics but if you suspect the temperature switch, just pull the wire off of it and ground the wire to turn on the relay and fans.
Well, I just tried that and still nothing.

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post #6 of 45 (permalink) Old Aug 15th, 17, 2:16 PM
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Bill
 
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Re: Electric radiator fans won't come on

I just tried to post a wiring diagram but I can't get it to work. Just search: 'fan wiring diagram' on the internet. You may not have the relay wired right. Do you have a test light to troubleshoot with?
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post #7 of 45 (permalink) Old Aug 15th, 17, 3:02 PM
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Re: Electric radiator fans won't come on

That picture of the relay looks questionable...

The socket portion is plugged in backwards (as it appears).

Typical stuff is made so the hold down screw is on the opposite side. The mounting tab would be on the same side as the mounting tab on the relay itself.

The socket is actually designed for plug in relays with no mounting tab.

Now, in case it is just Chinese-awesomeness manufacturing, pull the relay, and get a jumper wire and short the two big red wires together at the socket. Fans should start up if there are no other issues with wiring.

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post #8 of 45 (permalink) Old Aug 15th, 17, 3:03 PM Thread Starter
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Re: Electric radiator fans won't come on

Quote:
Originally Posted by 69SS454 View Post
I just tried to post a wiring diagram but I can't get it to work. Just search: 'fan wiring diagram' on the internet. You may not have the relay wired right. Do you have a test light to troubleshoot with?
Yes, I do.

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post #9 of 45 (permalink) Old Aug 15th, 17, 3:13 PM
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Re: Electric radiator fans won't come on

Quote:
Originally Posted by Coppertop View Post
That picture of the relay looks questionable...
Lol, just the relay?

Why don't you contact the manufacturer for support?

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post #10 of 45 (permalink) Old Aug 15th, 17, 3:21 PM Thread Starter
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Re: Electric radiator fans won't come on

Quote:
Originally Posted by Coppertop View Post
That picture of the relay looks questionable...

The socket portion is plugged in backwards (as it appears).

Typical stuff is made so the hold down screw is on the opposite side. The mounting tab would be on the same side as the mounting tab on the relay itself.

The socket is actually designed for plug in relays with no mounting tab.

Now, in case it is just Chinese-awesomeness manufacturing, pull the relay, and get a jumper wire and short the two big red wires together at the socket. Fans should start up if there are no other issues with wiring.
Joe, the plug only goes in one way on this one. I'll try jumping it.

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post #11 of 45 (permalink) Old Aug 15th, 17, 3:32 PM Thread Starter
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Re: Electric radiator fans won't come on

Quote:
Originally Posted by Hotwire View Post
Lol, just the relay?

Why don't you contact the manufacturer for support?
Hey now, don't make fun of me. I am trying. I am a novice.

Manufacturer probably speaks Indian or Chinese.

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post #12 of 45 (permalink) Old Aug 15th, 17, 3:46 PM Thread Starter
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Re: Electric radiator fans won't come on

Well, I jumped the two 18g black wires with a 12g wire directly to battery and sure enough, fans came ON. So, what does that tell me? I bad ground? A bad temperature switch?

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post #13 of 45 (permalink) Old Aug 15th, 17, 3:50 PM
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Re: Electric radiator fans won't come on

Quote:
Originally Posted by Ethan1 View Post
Well, I jumped the two 18g black wires with a 12g wire directly to battery and sure enough, fans came ON. So, what does that tell me? I bad ground? A bad temperature switch?
Next, put the relay back in, and check for 12+ on one side and ground the other on the relay signal wires. If the fans don't run, does the relay even click?

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post #14 of 45 (permalink) Old Aug 15th, 17, 3:50 PM
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Re: Electric radiator fans won't come on

Now that you know the fans work, the next step it to get them to work with the relay in place.. Don't worry about the temp sensor just yet, take it one step at a time and you will find out if you have a relay problem or a temp switch issue.

For now, make sure you have your relay wired correctly. I am assuming you have an 87A relay and not a 87.. Tell us which wires you have where using the terminal numbers here...

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post #15 of 45 (permalink) Old Aug 15th, 17, 4:14 PM Thread Starter
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Re: Electric radiator fans won't come on

Quote:
Originally Posted by Bart_Swisher View Post
Now that you know the fans work, the next step it to get them to work with the relay in place.. Don't worry about the temp sensor just yet, take it one step at a time and you will find out if you have a relay problem or a temp switch issue.

For now, make sure you have your relay wired correctly. I am assuming you have an 87A relay and not a 87.. Tell us which wires you have where using the terminal numbers here...
Yes, I have an 87A relay. 30 goes to the battery, 86 goes to the temperature switch, 85 goes to 12v ignition source and 87 goes to fans. 87A is closed.

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