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I have a crazy case of parasitic drain.When driving, power drops, going reverse is even worse.When parked,the battery is drainned beyond recharging, the car has killed 3 optima batteries.

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Normally what you do is to take off one battery terminal cable, and them put a test light across the gap between the cable end and battery post it was removed from.
Then you pull fuses and relays one at a time until the light goes out.
It could also be the alternator itself, so try disconnecting that.
A major short within the fuse box is also possible.
Accident damage areas are places to look for damaged insulation.
Do not start the vehicle, because a heavy short like that will quickly destroy the alternator.

Posted on Mar 12, 2011

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Posted on Jan 02, 2017

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You can check with a 12v test light or an amp meter. If you take off one of the battery terminal ends, (preferably the negative) and run the test light or amp meter in series from the battery post to the cable end, see if it lights up.


If it does, then you will want to start pulling fuses one by one until it goes out. When it goes out, then that is the circuit that is causing the draw. If not, then the battery is bad, as it can't hold a charge.

The recommendation for maximum parasitic drain is around 30 mA (0.030 amp). A typical drain today actually falls into the 7-12 mA range, even though some vehicles do approach the maximum. Multiply the drain (in amps) by the time (in hours) the battery sits without being recharged. The result is the amount of AH consumed by the parasitic drain. The actual drain may be small, but over time the battery grows steadily weaker.

Just remember to keep all of the doors closed when you do this and disconnect the hood light if there is one, thanks

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The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
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You may have a parasitic drain on the battery.
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2005 ford f150 stalls when driving pull over put in park no power to starter wait a few it starts goes a coupel blocks and stalls again


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Autozone, Advance, and Oreilys will check your onboard computer free either with a scanner or you need to ask for a charging system check.

If you watch your dashboard Voltmeter, you will probably see it drop the charging after the vehicle has been run about 5 minutes . It will do the same thing after a jump start too. I have been told that you never want to jump start the newer Fords.

Many Ford, Lincoln, and Mercury products act this way. I have yet to see a TSB or printed answer from Ford on this problem. My opinion is that the Batterysaver feature is part of the problem with the Antitheft and battery being the other problems.

The Antitheft drops the Starter voltage to the Starter to 7 Volts or less, if it detects someone messing with the battery. The Batterysaver cuts off Parasitic power drains. Unfortunately the Batterysaver can identify your charging system as a Parasitic drain and disconnect that circuit.
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I have had clients whose batteries were completly drained at 70MPH when the charging system stopped charging miles earlier. So watch your Voltmeter before you consider it repaired.

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Hi.

First ensure that battery is OK. If battery drains while driving, then the problem is related to alternator. Check that there is no problem with dome light or other device staying on because of a shorted switch.

If the rest is OK and battery drains when the truck is parked, check for contacts that may result in parasitic drains. See : Parasitic Battery Drain.

Regards.

Ginko

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