Parasitic drain?
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Laughing Gas
Joined: May 2002
Posts: 871
Likes: 36
From: Ohio
Parasitic drain?
2010 F150 issue. I’ve been trying to solve a battery issue following using a video posted by Fordtechmakuloco. I have solved some of the problem, tracing a drain to a USB adapter I was using. Now, I have a constant draw at about .022 amps, which is perfect acceptable. However, I will quickly spike to about 3 times that level and just as quickly go away. It may sit there for 3-5 minutes before it spikes. I don’t see how I can find it when it goes away within 1 second. Does anyone have a suggestion as to some problem areas to search?
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Laughing Gas
Joined: May 2002
Posts: 871
Likes: 36
From: Ohio
Thread Starter
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Laughing Gas
Joined: May 2002
Posts: 871
Likes: 36
From: Ohio
Trying to figure out more about the BMS and how it works…… it seems that Ford didn’t start putting them on until 2011. That leaves my truck out since it’s a 2010. Oh well, must be something else.
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Laughing Gas
Joined: May 2002
Posts: 871
Likes: 36
From: Ohio
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Hotshot
Joined: Jul 2005
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DO you get your random "SPIKES" fairly often ? If so, you can pull the "radio" fuse and watch for an hour... Then pull the "climate( heater) fuse and watch for an hour.......... etc........ Thats how you determine the location.... Its random and time consuming for a test..
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Thread Starter
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Laughing Gas
Joined: May 2002
Posts: 871
Likes: 36
From: Ohio
DO you get your random "SPIKES" fairly often ? If so, you can pull the "radio" fuse and watch for an hour... Then pull the "climate( heater) fuse and watch for an hour.......... etc........ Thats how you determine the location.... Its random and time consuming for a test..
Tuned
Joined: Apr 2015
Posts: 277
Likes: 67
From: N.E.Indiana
Are you getting any where with this? Something that might make it a little less painful would be if you have a digital meter with memory function, you can just check back now and then instead of standing there staring at meter all day.
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Laughing Gas
Joined: May 2002
Posts: 871
Likes: 36
From: Ohio
Thread Starter
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Laughing Gas
Joined: May 2002
Posts: 871
Likes: 36
From: Ohio
BSI, SJB microprocessor
I’ve narrowed my amperage spike to fuse 5 in the kick panel. This includes keypad illumination (no key pad on my truck), brake shift interlock and the SJB microprocessor. I’m hoping for the simpler one (BSI) because the smart junction box sounds a whole lot more complicated
4wd Low
Joined: May 2022
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Likes: 7
For what it's worth, I have a 2013 F150 ecoboost purchased brand new.
Fought parasitic drain from 6 months old. Ford customer service assured me there would be support beyond warranty as it had been so many instances and always handled by ford but never resolved. Few miles out of warranty, they washed their hands, as expected.
I run an optima yellow top battery. Give it a good charge every 6 months and no issues with being stranded at least.
Parasitic draw still exists but it doesn't kill my battery.
I went through the same steps as you just to realize I was chasing my tail.
If you figure it out, I will be keenly interested.
Fought parasitic drain from 6 months old. Ford customer service assured me there would be support beyond warranty as it had been so many instances and always handled by ford but never resolved. Few miles out of warranty, they washed their hands, as expected.
I run an optima yellow top battery. Give it a good charge every 6 months and no issues with being stranded at least.
Parasitic draw still exists but it doesn't kill my battery.
I went through the same steps as you just to realize I was chasing my tail.
If you figure it out, I will be keenly interested.
Lead Driver
Joined: Jun 2005
Posts: 8,463
Likes: 724
From: Calgary Canada
Sometimes the simplest fix for parasitic drain is to connect a battery maintainer when the vehicle sits more than a couple of days. Would be more satisfying not to require that, but . . .
More Turbo
Joined: Jun 2014
Posts: 718
Likes: 92
From: Asheboro, NC
^ this. I get the impression that some folks are opposed to disconnecting the BMS but I had all sorts of problems following a battery replacement until I did it. Seriously, what's it going to hurt to disconnect it for a while and see what happens? Assuming of course the vehicle has one, the OP says his 2010 doesn't but I'd have to verify hands on and not blindly believe something I read on the neenerweb, especially (as he states) when "it seems...." is involved.