Relay Question
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From: Harrisonburg, VA
Relay Question
Okay, So my truck is almost roadworthy again, only thing is I went to the truck today after like the 3rd day of not having even opened the door, and I found the batts were dead....GRR!
I have never had my batts die so I figured the culprit had to be the new epump...
So I got the voltmeter and sure enough the damn thing had 12volts running to it and the relay was warm. Its a confusing relay, one of those Ice Cube ones with the brick you mount it on.
When I say the damn thing had 12volts running to it, it only had 12vs off the one wire from the battery. But isn't it always going to have 12v's hitting it? Its always going to be drawing that much current right? Regardless of weather or not the pump is on.
Not sure if I worded this correctly, so please ask if you dont understand.
I have never had my batts die so I figured the culprit had to be the new epump...
So I got the voltmeter and sure enough the damn thing had 12volts running to it and the relay was warm. Its a confusing relay, one of those Ice Cube ones with the brick you mount it on.
When I say the damn thing had 12volts running to it, it only had 12vs off the one wire from the battery. But isn't it always going to have 12v's hitting it? Its always going to be drawing that much current right? Regardless of weather or not the pump is on.
Not sure if I worded this correctly, so please ask if you dont understand.
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Joined: Jul 2011
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one pole of a relay no matter what kind of relay will always be hot that is how a relay works. you have a constant 12V going to one pole, another pole comes from a swtiched voltage source, another pole is ground, then the final pole goes off to thing that is going to be switched on.
now the relay should not be warm under normal conditions. do you have 12V coming out of the relay going to the pump? if so then the relay may be hooked up wrong or your switched pole on the relay is constantly in the on position.
now the relay should not be warm under normal conditions. do you have 12V coming out of the relay going to the pump? if so then the relay may be hooked up wrong or your switched pole on the relay is constantly in the on position.
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Senior User
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From: Harrisonburg, VA
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From: Denver, CO
Do you have wiring instructions? If you don't you can almost always download them. Find a model number and Google "wiring diagram". The terminals on relays are coded. Also if it is wired correctly, you should hear it click when engaged. Maybe have someone turn on the key or flip the switch while you listen. If it wired correctly the only thing that could draw on your battery is the e-pump, is it hot or can you hear it trying to pump. Voltage and current are two entirely different things. As previously stated, you will always have power to one terminal of a relay. When the relay is activated or switched "ON" there should be voltage to three terminals, one from the battery, one to the equipment being turned on, and one from the switch to activate the relay. The relay must also be properly grounded. Current will only be present when energy is being used. Much more difficult to determine than voltage. A relay will always get warm when engaged, but shouldn't get hot.
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Thread Starter
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Senior User
Joined: Jan 2012
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From: Harrisonburg, VA
Okay very good to know ill see if I can get better information for you guys on my wiring scheme for the pump. Thanks for the insight on all this im just struggling with electricity.
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