Parasitic draw progress - ABS pump??
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Cross-Country
Joined: Jul 2007
Posts: 96
Likes: 21
From: Cartersville, GA
Parasitic draw progress - ABS pump??
I've been chasing a ~2amp parasitic draw in my free time. Fun stuff. Truck sits most of the time so I leave batteries disconnected until I can mess with it. Finally got a clamp meter and that made pulling fuses, etc much more doable as a one man job. When I pull and then reinstall fuse #52 the draw disappears for a few seconds and then returns. Manual says fuse #52 is the ABS pump. Anyone dealt with this before? Could this possibly be a wheel sensor issue? I just started getting the service advance track/hill descent errors on a return road trip from Colorado.
Thanks for any insight!!.
2019 F350 DRW Lariat, 6.7L, 4wd, 8' bed, lifted, 50k miles.
Thanks for any insight!!.
2019 F350 DRW Lariat, 6.7L, 4wd, 8' bed, lifted, 50k miles.
Fleet Mechanic
Joined: Aug 2011
Posts: 1,576
Likes: 264
Just to clarify, when you pull fuse 52 the draw completely disappears till you put the fuse back in or the draw disappears for a few seconds and then returns before you put the fuse back in?
If it’s for sure to do with the ABS module then it will most likely be one of the solenoids stuck on or less likely the pump is half stuck on. It won’t be a wheel speed sensor as that would have went up in smoke with a draw like that.
If it’s for sure to do with the ABS module then it will most likely be one of the solenoids stuck on or less likely the pump is half stuck on. It won’t be a wheel speed sensor as that would have went up in smoke with a draw like that.
Thread Starter
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Cross-Country
Joined: Jul 2007
Posts: 96
Likes: 21
From: Cartersville, GA
Just to clarify, when you pull fuse 52 the draw completely disappears till you put the fuse back in or the draw disappears for a few seconds and then returns before you put the fuse back in?
If it’s for sure to do with the ABS module then it will most likely be one of the solenoids stuck on or less likely the pump is half stuck on. It won’t be a wheel speed sensor as that would have went up in smoke with a draw like that.
If it’s for sure to do with the ABS module then it will most likely be one of the solenoids stuck on or less likely the pump is half stuck on. It won’t be a wheel speed sensor as that would have went up in smoke with a draw like that.
Any idea how many solenoids are connected to it and how to locate them?
Cargo Master
Joined: Apr 2003
Posts: 2,059
Likes: 426
From: Too close to Houston
If the draw remains while that fuse is pulled then it’s definitely not in that circuit.
Seems more like it’s a circuit that ‘wakes up’ when you reinstall that fuse.
2A is pretty good load. Do the newer fuses we have give you the ability to check mV drop across them? Last time I was looking for parasitic drop was in a ‘92 and the fuses could be probed from the top. The energized circuit would have a few mV drop across the fuse. Other fuses showed 0.
I imagine finding the culprit in a ‘19 is much harder since you’ll have to wait for the truck to go to sleep then access the fuse panels without waking it up.
Seems more like it’s a circuit that ‘wakes up’ when you reinstall that fuse.
2A is pretty good load. Do the newer fuses we have give you the ability to check mV drop across them? Last time I was looking for parasitic drop was in a ‘92 and the fuses could be probed from the top. The energized circuit would have a few mV drop across the fuse. Other fuses showed 0.
I imagine finding the culprit in a ‘19 is much harder since you’ll have to wait for the truck to go to sleep then access the fuse panels without waking it up.
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Cross-Country
Joined: Jul 2007
Posts: 96
Likes: 21
From: Cartersville, GA
Well Thanks to this forum I solved it. The "big white connector" by the spare tire struck again. I read posts on this forum about that connector causing all kinds of issues, some ABS related. So I popped the connector open and immediately some dusty dirt came out. Cleaned the connector up with contact cleaner, put a ton of dielectric grease on it, pushed it back together very tight and wrapped it up in electric tape. The draw disappeared along with the service advance track messages.
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