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Old 05-10-2021, 08:43 AM   #1
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Intellitec Pump Control Module

I had to change my water pump recently (it was working normally before the change), but now the pump runs even with the switch turned off. While I only pulled the two leads off, I did take the attached picture of the other two control leads. The white going to the ground terminal makes sense to me. The yellow with black stripe must be the switch leads. Here is where the wiring doesn't make sense to me after looking at the intellitec wiring schematic - I would think the red to the pump would go on the LOAD terminal and a constant hot would go to the +12V terminal. But that is not the way it was wired. The yellow and red wire spliced together were on the LOAD and the pump ground was on the +12V. Doesn't make sense to me and I want to make sure I have it right before I install a new controller.

Can someone take a picture of their controller wiring (mine is just under the wet bay panel) so that I can compare and do a little troubleshooting?
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Old 05-10-2021, 09:04 AM   #2
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The Water Pump Control switches the negative to the pump.

The constant +12 Volt & the positive wire to the pump go on the +12V terminal.
The pump negative (ground) connects to the Load terminal.
The Gnd terminal connects to system (chassis) ground.
The SW terminal goes to the remote switches.
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Old 05-10-2021, 09:33 AM   #3
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Steve - is the remote switch wire set the Yellow with a black stripe?
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Old 05-10-2021, 09:38 AM   #4
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If so, it is wired correct. But my controller must be screwed up. The pump keeps running when I turn off the switch in the coach.
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Old 05-10-2021, 10:03 AM   #5
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Yes the remote switch wires are yellow/black stripe.
The two solid yellows are the constant +12 V to the controller & pump + (red).
My wire colors are different but the load wire does go to the pump negative. I have attached 2 pic one of the controller & the wires connecting to the pump.
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Old 05-10-2021, 10:08 AM   #6
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Originally Posted by ColoradoBnd View Post
If so, it is wired correct. But my controller must be screwed up. The pump keeps running when I turn off the switch in the coach.
The yellow & red should be on the +12 terminal.
The black from the pump should be on the load terminal.
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Old 05-10-2021, 10:37 AM   #7
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Intellitec Pump Control Module

Check the ground.
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Old 05-10-2021, 02:39 PM   #8
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A quick explanation might help...

The pump controller is a logic switch. Your water pump is connected to 12vdc+ from a fused source. It gets it's GND (12vdc-) thru that controller. LOAD terminal.

Now that you know that...the switch SW terminal is where all the yellow wires go. Each time you press a momentary switch, many located around the coach...you are temporarily shorting the yellow signal wire to ground. The pump controller sees this and toggles it's state. In HI state, the voltage on the signal wires is greater than 3.3vdc which will pass thru a zener diodes breakdown voltage and cause the green led to light...toggle again, the controller switches to LO logic with a voltage less than 3.3vdc on the signal wire. This is below the breakdown voltage on the diode...and your green led goes dark. HI state allows the pump terminal to connect to ground and the pump circuit is completed. In LO state the pump terminal is disconnected from ground...and the pump circuit is open...and that's what turns it off.

So...the controller needs a 12vdc+, 12V+ and 12vdc- GND....to power it...and have a ground to offer to the pump during HI state. The pump LOAD terminal goes to the black wire on the pump...the Signal/Switch SW terminal is connected to one or more of the special water pump switches with Yellow/red stripe wires. They use a momentary switch...and have a resistor, diode, and green led. The switch has the signal wire connected to one terminal and a gnd wire attached to the other. Orienyation is important! Remember the switch simply shorts the signal to ground...and this is detected by the controller. It then toggles the state of the contoller...to change from HI to LO or LO to HI.

If you ever want to check the pump separate from the controller...simply remove the pump lead (LOAD) and touch it to a frame ground. Again, the Positive on the pump is fused, always hot...it just needs a ground to complete the circuit.

Once you know how it works...it's much easier to understand the wiring and how to troubleshoot.
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Old 05-10-2021, 02:57 PM   #9
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Thank you all! Going to tackle it here in a few minutes using the new controller
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Old 05-10-2021, 06:05 PM   #10
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It was the control module. All normal now that it was replaced. Thanks all again for the help.
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Old 05-10-2021, 06:21 PM   #11
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It was the control module. All normal now that it was replaced. Thanks all again for the help.
Thanks for letting us know the outcome.
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Old 05-10-2021, 07:05 PM   #12
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It was the control module. All normal now that it was replaced. Thanks all again for the help.
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