Relay Problems HELP ASAP!!!

MATREDGT · Jul 2, 2005

Alright I'm in the middle of doing the fog light fix off of Corral.net. Everything went okay except I can't get any power out of my relay. I have tried a new one with the same results. Everything is wired correctly and connections are good. I can hear the relay click when I turn the fog light switch on and off but I get no output voltage on the 30 pin. What in the heck would cause something like this to happen??? I'm at a loss right now. Help me quick so I can finish this up shortly. Thanks

twolo4u2c2 · Jul 2, 2005

U have to have a wire backwards or no power going in to the relay. You shoud have two wires hot at the relay. One for the fog light supply and one for the relay to click(whick connects you the the supply. hope this helps

MATREDGT · Jul 2, 2005

twolo4u2c2, I don't think you get what I am saying, or I'm not explaining it right. I do get the relay to click. I checked continuity across the 12V IN and 12V OUT when the relay is switched on and I do get continuity. It has a good ground, and I've checked how it's hooked so many times that I lost count.

Again I have 12V IN, a good ground, 12V from a switched source (when the switch is in the ON position), but I get no voltage on the 12V OUT terminal. I have no idea what else to check. The only thing that I think could be wrong is that the relay has to much resistance and it is not closing 100%, but I'm pretty sure that isn't happening. I don't even know if that is possible. Anyone else have any other ideas?

HISSIN50 · Jul 2, 2005

Do you have an extra SPDT relay to swap in?

Good luck.

MATREDGT · Jul 2, 2005

HISSIN50 said:
Do you have an extra SPDT relay to swap in?

Good luck.

Yeah I went to radio shack a little bit ago and bought the exact same one again. I followed the schematic to a "T" but still got the same result. I hate this car when stuff like this happens. Thanks for the suggestions already, and please keep them coming.

HISSIN50 · Jul 2, 2005

So at the relay you have:
One constant power wire (sounds like it would be terminal 87 with the way you wired it)?

Then 12 volts to either terminal 85 or 86 when the fog lights are turned on?

And ground at the other terminal from above (i.e. if 86 has 12 volts when the switch is flipped on, 85 would have constant ground. You could also do it backwards and it will work).

And then when you have one relay coil terminal with 12 volts and one with ground (86 has 12 volts, 85 has ground, or vice verse. it does not matter), this is what energizes the relay and connects 87 and 30 together. 87A would not be used here.

I am thinking you might not have values quite like what is above, and that should do it. I would test real quick and post back.

Good luck.

MATREDGT · Jul 3, 2005

Okay HISSIN50, this is exactly how I have the relay hooked up. Oh and I only am using a SPST relay for what it's worth.

85 - Ground (it is good I have checked it and I have another working relay grounded here as well)
87 - Constant 12V (off the battery)
30 - Switched 12V trigger (comes off of the fog light switch)
86 - 12V OUT (to power the fog lights ON when the relay is triggered)

Now pin 86 is where the problem is. I am getting no voltage what so ever on it when the relay is triggered. There is an audible "click" when the switch closes and opens in the relay. I am also getting continuity between pin 87 and 86 when the relay is triggered. Like I said before I have swapped out this relay for a new one and I got the same result. I am at a loss right now, as I've never had a relay do this before. I have had relay's that would stay closed because the current draw through them was to much and the switch couldn't open ever when the 12V trigger was turned off, but this has never happened before. The only other thing I can think is that this relay is to big, but I don't see why that would affect it from allowing the current to flow through. It is designed for 12V systems and it is the one that is used in the directions I got to do this from Corral. Thanks again for the replies and keep them coming.

HISSIN50 · Jul 3, 2005

MATREDGT said:
Okay HISSIN50, this is exactly how I have the relay hooked up. Oh and I only am using a SPST relay for what it's worth.

85 - Ground (it is good I have checked it and I have another working relay grounded here as well)
87 - Constant 12V (off the battery)
30 - Switched 12V trigger (comes off of the fog light switch)
86 - 12V OUT (to power the fog lights ON when the relay is triggered)

I have never used a SPST relay, so forgive me if this is off-base. My recollection is that the control paths are the same for SPDT and SPST relays (and the difference is that the double-throw relay has a N.C. terminal [87A], which ST's dont). If I am wrong, stop reading.

Said another way, if you were using a SPDT relay, I think your wires are a little crossed.
85 is fine. 87 is fine. You appear to have 86 and 30 switched.

Good luck.

JRPony · Jul 3, 2005

I think you have you're relay wired wrong.
Terminal 30 should be connected to constant battery power. (KL30)
Terminal 87 should be you're output to the fog lights.
Terminal 86 is your coil input and
Terminal 85 is your coil output.

You say that terminal 86 is the output to the fog lights. That is not right. Terminal 86 is on the coil side of the relay. Terminal 86 and 85 are only supposed to handle small amounts of amperage. The high amperage flows through 30 and 87.

HISSIN50 · Jul 3, 2005

JRPony said:
I think you have you're relay wired wrong.
Terminal 30 should be connected to constant battery power. (KL30)
Terminal 87 should be you're output to the fog lights.
Terminal 86 is your coil input and
Terminal 85 is your coil output.

You say that terminal 86 is the output to the fog lights. That is not right. Terminal 86 is on the coil side of the relay. Terminal 86 and 85 are only supposed to handle small amounts of amperage. The high amperage flows through 30 and 87.

I think we already covered most of this. As for how you would wire it - that is fine. IIRC the instructions for the rewire he is using have the common and N.C. terminals switched from what you have (with most SPDT/SPST relays, it does not matter if one uses 30 as the common or for the N.C. terminal. His instructions use 30 as common and 87 as NC, which is fine. There is no need to change).
FWIW, I wire relays per your way, but we dont need to add unnecessary confusion.

JRPony · Jul 3, 2005

I agree that 30 and 87 are are interchangable with each other as well as 85 and 86 being interchangable.

MATREDGT said:
30 - Switched 12V trigger (comes off of the fog light switch)
86 - 12V OUT (to power the fog lights ON when the relay is triggered)

However, this is incorrect. The fog light switch should be wired to 86 (or 85), not 30. And 30 (or 87) should be the one that feeds power to the fog lights when the relay is activated.

HISSIN50 · Jul 3, 2005

JRPony said:
However, this is incorrect. The fog light switch should be wired to 86 (or 85), not 30. And 30 (or 87) should be the one that feeds power to the fog lights when the relay is activated.

Yep - we both agreed on that.

MATREDGT · Jul 3, 2005

Alright guys well I took both of your's advice and got it working. Now my new problem is that I either have a bad connection at my crimp-on terminals (need to teach my brother better, maybe?), or there is something in the relay internally that is loose. The fog light will come on when I twist the relay counter-clockwise and then they shut back off if I rotate it back clockwise. So I'm gonna have to investigate that a bit further tomorrow. Anyway thank you both very much for your help, I really do appreciate it.

Mike

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