How many amps when truck is off???? - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 12-22-2011, 07:01 PM Thread Starter
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How many amps when truck is off????

My batteries keep goin dead , i have both new batteries and a new alternator,
if i let the truck sit for more than 2 days it wont start, i hooked a multimeter to it and seen when the truck isnt running and hood light off and interior lights off i have a 2.9amp draw, just wondering how much of a draw any one elce has????? seems like alot to me but im not to sure,
Thanks Mike.

Mike
2004 f350 5 inch lift 20x10 motometals w 38" toyo's
2002 f150 6 inch with dana 44
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post #2 of 15 Old 12-22-2011, 07:37 PM
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That seems a little excessive, pull fuses one at a time and watch the meter. If the current flow slows or stops you now know what circuit it is. I believe less than 1a for computer vehicles

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post #3 of 15 Old 12-23-2011, 04:59 AM
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What you are seeing is way too much draw if you are taking an amp reading after the truck has been off for 5 min or so. you should be only drawing milli Amps (mA), however I do not remember how many is normal. I had a similar problem with my Explorer and after checking the alternator and pulling fuses it turned out to be the battery. if after 5 min or so you still have the 2.9 amp draw then codyrock is right you will need to pull fuses to eliminate the draw. I have also heard that a bad diode in an alternator will cause batteries to draw down over time as well, but I do not know how true it is.

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post #4 of 15 Old 12-23-2011, 05:04 AM
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Please post what you find to be the issue. I have a similar issue, but a lower draw.

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post #5 of 15 Old 12-23-2011, 12:08 PM Thread Starter
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i pulled some fuses and found when i pull my fuse for the cluster (speedo) i here a relay or sumthing click and the draw goes down to about .18 amp witch seems better , the only thing in the speedo i can thing of using power would be the theft light but that shouldnt draw **** all. i know these trucks are know for the fuse box goin bad aswell as the gem module, and ideas guys???
Thanks Mike.

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2004 f350 5 inch lift 20x10 motometals w 38" toyo's
2002 f150 6 inch with dana 44
1991 bronco efi 460 4spd 16inch lift dana 60, sterling 10.25 and 40" boggers
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post #6 of 15 Old 12-23-2011, 12:48 PM
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You might try a search on the web for an electrical drawing. Most of the time the vehicle manufacturer will only put a general description of what that fuse controls. There may be 5 or more things running off of the fuse labeled speedo. I will try and look when I get home to see what I have for electrical drawings that might be of some help. .18 amps sounds much better. I could also be a stuck relay, but without a drawing I would not know where to start.

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post #7 of 15 Old 12-23-2011, 03:34 PM Thread Starter
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yeah i kinda think its a stuck relay, but i dont know where to start looking haha

Mike
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post #8 of 15 Old 12-23-2011, 03:45 PM
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gem is where id start

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post #9 of 15 Old 12-23-2011, 08:41 PM
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Do you have anything tapped into the tach? I have heard of remote starts drawing down the battery when connected to the tach without isolation.

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post #10 of 15 Old 12-23-2011, 08:46 PM
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Quote:
Originally Posted by Scoutin View Post
What you are seeing is way too much draw if you are taking an amp reading after the truck has been off for 5 min or so. you should be only drawing milli Amps (mA), however I do not remember how many is normal. I had a similar problem with my Explorer and after checking the alternator and pulling fuses it turned out to be the battery. if after 5 min or so you still have the 2.9 amp draw then codyrock is right you will need to pull fuses to eliminate the draw. I have also heard that a bad diode in an alternator will cause batteries to draw down over time as well, but I do not know how true it is.
a bad diode will most certainly draw down your batteries. been there done that lol

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