30 minute circuit draining - Ford Transit USA Forum
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post #1 of 8 (permalink) Old 01-10-2017, 12:59:AM Thread Starter
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30 minute circuit draining

I've not read of this happening, so I seek insight from the forum:
- Sunday morning the battery was too weak to start the van
- I put it on a charger until this morning, and it seemed OK all day (single OEM batery)
- Upon returning home this evening, the 30 minute circuit still was on almost an hour after doors were locked

> preliminary conclusion: it seems the 30 minute circuit remained active overnight Saturday, draining the battery with the few low- power accessories tied into it on a rare cold night in Central Florida.

Has anyone had issues with the 30 minute circuit not shutting off? It is still to early for me to thoroughly troubleshoot what might be going on.

XLT wagon Silver/Charcoal, 2-12 Passenger (on any given day), alloy wheels, Ionic running boards, various modifications ongoing.
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post #2 of 8 (permalink) Old 01-10-2017, 01:59:AM
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Power cycle it. Fixes most everything with a computer in it. Pull the battery lead and let it sit a bit before reconnecting.
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post #3 of 8 (permalink) Old 01-10-2017, 08:09:AM
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Originally Posted by alarmist View Post
Power cycle it. Fixes most everything with a computer in it. Pull the battery lead and let it sit a bit before reconnecting.
This should do it. If you connect a charger to the vehicle without removing the battery it seems to really screw things up. It happened to me on my F150 and the Transit. I've since learned to pull the battery cables and then charge it. Weird that it will handle a jump start from another vehicle just fine but not a battery charger in jump start mode.
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post #4 of 8 (permalink) Old 01-10-2017, 09:46:AM
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When using jump start from a battery charger you are putting a really nasty DC component into the vehicle system without the filtering effects of the battery as it was dead!
When jump starting from another vehicle you are getting pretty pure DC.

Charged batteries are a good filter- akin to really large capacitor.

This nasty DC can wreak all kinds of havoc with sensitive devices. Personally with all the electronics I would not use jump start from an AC powered charger on a late model vehicle.

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post #5 of 8 (permalink) Old 01-10-2017, 10:50:AM
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back in the day before computers on very cold day you could use a vehicle 24 volt electrical system to jump off a vehicle with a 12 volt electrical system and it would do no harm to the 12 volt vehicle! Today with a battery charger set on engine boost you are sending almost 18 volts DC, along with the poorly filtered AC from the 120 volt input voltage of the charger into the engine computer, that is enough to scramble anything! i learned this from using a battery charger to jump start modern nissan propane powered forklifts, the only way you can start them with a battery charger is to have it set on a slower charge!

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post #6 of 8 (permalink) Old 01-10-2017, 05:11:PM
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You could try a jump box that's battery powered.
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post #7 of 8 (permalink) Old 01-10-2017, 07:07:PM
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My Transit struggled to start today. I have a dual battery so not sure what happened. No trouble starting after work today. I will keep this thread in mind if I have trouble in the morning.

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post #8 of 8 (permalink) Old 01-10-2017, 09:40:PM Thread Starter
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Just to be clear, I did not use the battery charger to jump start the van, only to slow charge it overnight.
Also, the 30 minute circuit was back to normal today, so perhaps what I observed last night was due to something else.
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