So I've had the SVE electric fans on my 91 for about a year now using a Derale adjustable controller with a thread in temperature probe installed in the water neck. I had one of these controllers fail on me pretty quickly, so LMR sent me a replacement. I have been using this setup for about 6 months with no further issues. Suddenly my fans wouldn't turn off. They would come on as soon as I turned the engine on and stay on until the battery died (I had them wired directly to the battery). They would not turn off unless I unplugged the probe from the controller. I replaced the probe, and they still ran eternally. I figured the controller must have gone haywire, so I decided scrap my Derale and invest in a nicer setup.
I purchased a Flex-a-Lite variable speed controller that also has the thread in probe and a 3 way override switch (up is on regardless of temp, flat lets the controller operate fans, down is off, regardless of temp). I spent an entire day wiring, soldering, heat shrink wrapping, and looming all wires and connections.
The controller is now wired to the ignition, so the fans turn off when the key is off. I wired the override switch to the controller, and quadruple checked every wire to make sure it was connected correctly.
Here's where it gets confusing.
I finally start my car, only to find that the fans, once again, come on right away! No big deal though, right? I have a switch that will turn them off. So I flick them off, but they keep going. I shut the car off, and they turn off. I try again and they immediately come on again. I switch them off and look at the controller and see it's not getting the override signal (it has LED indicators).
I pull the plugs to the probe, and they turn off. I then try switching them on, and they come on. I check the indicator, and they're receiving the override signal from the switch.
So, the switch only works with the probe unplugged. With the probe plugged in, the fans come on at all times (keep in mind the engine was completely cold when I did all of this). This is the same problem I had with my Derale, with a totally different control system wired completely differently, and a new probe.
Why are the turning on? Why does the switch only work when the probe is disconnected?? Why did this problem start out of the blue, and continue when every part of the system has been replaced except the fans?
Anyone have any ideas of experienced something like this before? I am beyond puzzled and beginning to get frustrated. I have checked 10+ times to make sure everything is plugged in where it should be and wired exactly how the instructions say.
Thanks in advance!
I purchased a Flex-a-Lite variable speed controller that also has the thread in probe and a 3 way override switch (up is on regardless of temp, flat lets the controller operate fans, down is off, regardless of temp). I spent an entire day wiring, soldering, heat shrink wrapping, and looming all wires and connections.
The controller is now wired to the ignition, so the fans turn off when the key is off. I wired the override switch to the controller, and quadruple checked every wire to make sure it was connected correctly.
Here's where it gets confusing.
I finally start my car, only to find that the fans, once again, come on right away! No big deal though, right? I have a switch that will turn them off. So I flick them off, but they keep going. I shut the car off, and they turn off. I try again and they immediately come on again. I switch them off and look at the controller and see it's not getting the override signal (it has LED indicators).
I pull the plugs to the probe, and they turn off. I then try switching them on, and they come on. I check the indicator, and they're receiving the override signal from the switch.
So, the switch only works with the probe unplugged. With the probe plugged in, the fans come on at all times (keep in mind the engine was completely cold when I did all of this). This is the same problem I had with my Derale, with a totally different control system wired completely differently, and a new probe.
Why are the turning on? Why does the switch only work when the probe is disconnected?? Why did this problem start out of the blue, and continue when every part of the system has been replaced except the fans?
Anyone have any ideas of experienced something like this before? I am beyond puzzled and beginning to get frustrated. I have checked 10+ times to make sure everything is plugged in where it should be and wired exactly how the instructions say.
Thanks in advance!
