Electric radiator fans won't come on - Page 2 - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #16 of 45 (permalink) Old Aug 15th, 17, 4:18 PM Thread Starter
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Re: Electric radiator fans won't come on

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Originally Posted by Pioneer4x4 View Post
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?
Can you please explain further, Ed. I'm not following. Which are the relay signal wires?

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post #17 of 45 (permalink) Old Aug 15th, 17, 4:21 PM Thread Starter
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Re: Electric radiator fans won't come on

Did I wire up 85 wrong? It says relay coil GROUND. Not 12v source.

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post #18 of 45 (permalink) Old Aug 15th, 17, 4:31 PM Thread Starter
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Re: Electric radiator fans won't come on

The instructions that came with the kit, said to wire to starter solenoid or ignition switch. Should I screw that and ground it. Or would that just cause more issues?

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post #19 of 45 (permalink) Old Aug 15th, 17, 4:42 PM
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Re: Electric radiator fans won't come on

85 should be a ground, not 12v. 87 to the fans, then take 86 to a hot 12v for now and your relay should kick on

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post #20 of 45 (permalink) Old Aug 15th, 17, 4:48 PM
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Re: Electric radiator fans won't come on

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Originally Posted by Ethan1 View Post
Can you please explain further, Ed. I'm not following. Which are the relay signal wires?
85/86 energize the coil to turn on the relay. +12 on one, ground on the other, one of them switched. It doesn't matter which is which for ground or +12.
So according to what you said in post #15 test for +12 at 85, then ground 86, relay should click and fans turn on.
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post #21 of 45 (permalink) Old Aug 15th, 17, 4:50 PM
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Re: Electric radiator fans won't come on

What he said....

Here is what happens....

30 is constant hot from Battery
85 is ground
87 is open to device (fans)
86 is 12v trigger..

When 86 is energized (by the temp switch etc) it pulls the switch leg from 87A down to 87 and completes the circuit between 30 and 87. Just like your finger is the trigger to flip a light switch up or down. I don't mean to simplify it that way but that's an easy analogy.

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post #22 of 45 (permalink) Old Aug 15th, 17, 4:50 PM Thread Starter
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Re: Electric radiator fans won't come on

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Originally Posted by Bart_Swisher View Post
85 should be a ground, not 12v. 87 to the fans, then take 86 to a hot 12v for now and your relay should kick on
Okay, I'll give that a try. Thanks, Bart!

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post #23 of 45 (permalink) Old Aug 15th, 17, 4:56 PM Thread Starter
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Re: Electric radiator fans won't come on

Quote:
Originally Posted by Bart_Swisher View Post
What he said....

Here is what happens....

30 is constant hot from Battery
85 is ground
87 is open to device (fans)
86 is 12v trigger..

When 86 is energized (by the temp switch etc) it pulls the switch leg from 87A down to 87 and completes the circuit between 30 and 87. Just like your finger is the trigger to flip a light switch up or down. I don't mean to simplify it that way but that's an easy analogy.
Do you want me to run a wire from the temperature switch to a 12v source?

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post #24 of 45 (permalink) Old Aug 15th, 17, 5:00 PM Thread Starter
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Re: Electric radiator fans won't come on

Quote:
Originally Posted by Pioneer4x4 View Post
85/86 energize the coil to turn on the relay. +12 on one, ground on the other, one of them switched. It doesn't matter which is which for ground or +12.
So according to what you said in post #15 test for +12 at 85, then ground 86, relay should click and fans turn on.
I did that and the relay clicks, but fans don't turn on. Bad relay?

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post #25 of 45 (permalink) Old Aug 15th, 17, 5:11 PM
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Re: Electric radiator fans won't come on

Always connect ground to relay #85 terminal and power to #86.

Some relays have integrated suppression diodes across the coil.

Connecting things wrong can cause damage.

It is dangerous to "assume" all relays are just a coil across the activation terminals.
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post #26 of 45 (permalink) Old Aug 15th, 17, 5:15 PM Thread Starter
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Re: Electric radiator fans won't come on

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Originally Posted by Coppertop View Post
Always connect ground to relay #85 terminal and power to #86.

Some relays have integrated suppression diodes across the coil.

Connecting things wrong can cause damage.

It is dangerous to "assume" all relays are just a coil across the activation terminals.
But, what do I run to the temperature switch?

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post #27 of 45 (permalink) Old Aug 15th, 17, 5:16 PM
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Re: Electric radiator fans won't come on

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Originally Posted by Ethan1 View Post
I did that and the relay clicks, but fans don't turn on. Bad relay?

do this... connect a wire from 30 to your battery, a ground wire to 85, hook a wire from 87 to the hot lead of your fan, the other fan wire to ground. then hook a wire from 86 to your battery, you should hear a click and your fans should turn on. Ignore the temperature switch for now. If it works the way i laid out here then all you need to do is wire from 86 to your temperature switch instead of the battery. Once it gets hot enough for the temp switch to kick on, the fans should come on. if not then you have a bad temp switch.
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post #28 of 45 (permalink) Old Aug 15th, 17, 5:19 PM
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Ethan I was making fun of you buying all Chinese stuff, wth man..

Bart is confusing you and might have damaged your temp switch by putting batter power to it..

Turn your key on and ground the switch wire. If the relay clicks and fans come on, then it's the switch.

Also make sure your fans are blowing in the right direction..
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post #29 of 45 (permalink) Old Aug 15th, 17, 5:21 PM
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Re: Electric radiator fans won't come on

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Originally Posted by Hotwire View Post
Ethan I was making fun of you buying all Chinese stuff, wth man..

Bart is confusing you and might have damaged your temp switch by putting batter power to it..

Turn your key on and ground the switch wire. If the relay clicks and fans come on, then it's the switch.

Also make sure your fans are blowing in the right direction..
I said to ignore the temp switch, never said to put power on it
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post #30 of 45 (permalink) Old Aug 15th, 17, 5:44 PM
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Re: Electric radiator fans won't come on

It should be simple to check.
Grounding out the temperature switch should make the relay turn on the fans and if so the temperature switch is the problem.

If not,check voltage at #85 & #86
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