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Author Topic: F150 2 amp draw  (Read 17131 times)

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Offline daveismissing

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F150 2 amp draw
« on: March 01 2011, 07:42:55 PM »
Since we have some F150 expertise inhouse:

I have a wire that comes from the ignition switch and is supposed to provide 12v to the
alternator. It does that but when ignition is off instead of being an open circuit there is some resistance to ground. This inturn causes the alternator to drain the battery overnight.

Temporarily (yah right) solved it with a relay. Its gotta be the ignition swich contacts?
Anyone seen something similar?
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Offline Steve Wood

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F150 2 amp draw
« Reply #1 on: March 01 2011, 09:47:12 PM »
I would guess a bad diode in the alternator, myself
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Offline daveismissing

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Re: F150 2 amp draw
« Reply #2 on: March 01 2011, 11:24:15 PM »
Was my first guess too, after the battery.

Could not get an OEM alt, so I did put in a rebuild. Same thing.
Could be a shitty rebuild? Supposed to be decent (local)
Was already a rebuild in there, one of the really crappy ones that whined like a B*
Was at least happy to have that noise go away.

Also pulled the GEM and disassembled the fuseblock- mint, no corrosion.

Dunno why I'd see a semi-ground (was bloody freezing- don't remember how well I characterized it) back thru the ignition contacts...
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Offline Charlief1

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F150 2 amp draw
« Reply #3 on: March 01 2011, 11:43:36 PM »
If you've got a volt meter or a test light take the battery cable off and once you establish that it's drawing power then pull one fuse at a time intil the draw is gone. That will varify the problem Dave. Then tell me what curcuit it is and I'll try and find the diagram and see what's on it.
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Offline daveismissing

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F150 2 amp draw
« Reply #4 on: March 02 2011, 12:24:02 AM »
mini-fuse 10A position #19. My diagram shows ignition switch upstream and the alternator via idiot light downstream. Fuse pulled I'd see grounding on the upstream side of the block with ignition off.
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Offline Charlief1

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« Reply #5 on: March 02 2011, 01:49:34 AM »
I'll check Mitchell tomorrow Dave and see what I can find.
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Offline Charlief1

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« Reply #6 on: March 02 2011, 03:49:53 PM »
I need a year and engine size Dave. Is it 2 or 4wd?
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Offline daveismissing

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F150 2 amp draw
« Reply #7 on: March 02 2011, 07:42:36 PM »
1998 F150 XL extended 4WD 4.6 V8 Triton
blue w ugly old driver :)
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Offline Charlief1

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F150 2 amp draw
« Reply #8 on: March 02 2011, 08:10:33 PM »
Does it have the slow dimming interior light Dave? I'm looking at the system wiring diagrams rignt now.
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Offline Charlief1

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F150 2 amp draw
« Reply #9 on: March 02 2011, 08:22:00 PM »
Fuse 19 is for the charging light Dave. Take the fuse out and see if it's hot on both sides. If only on one side then the ignition switch is probably the issue. If I could post the diagrams I would but Mitchell uses it's own PDF reader and you can print it but that's all.
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Offline SuperSix

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F150 2 amp draw
« Reply #10 on: March 02 2011, 08:32:58 PM »
Quote from: "Charlief1 @ Wed Mar 02, 2011 8:22 pm"
Fuse 19 is for the charging light Dave. Take the fuse out and see if it's hot on both sides. If only on one side then the ignition switch is probably the issue. If I could post the diagrams I would but Mitchell uses it's own PDF reader and you can print it but that's all.


Alt-PrtSrcn, open up MS paint, Ctrl-V, Ctrl-P = Win!

Sorry, I'm a computer nerd...
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Offline Charlief1

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F150 2 amp draw
« Reply #11 on: March 02 2011, 08:44:02 PM »
Lost me there Mark. The site has it's own PDF reader and you can't use anything else to open them with. The site blocks any attempt to copy images.
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Offline SuperSix

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F150 2 amp draw
« Reply #12 on: March 02 2011, 09:01:10 PM »
Quote from: "Charlief1 @ Wed Mar 02, 2011 8:44 pm"
Lost me there Mark. The site has it's own PDF reader and you can't use anything else to open them with. The site blocks any attempt to copy images.


Pressing ALT and PrtScr keys at the same time does a screen capture of the active window. After that, open MS Paint. Pressing CTRL and V at the same time pastes the screen capture into Pain. Pressing CTRL and P at the same time opens up the print window.

Basically you can print anything you see on your screen. Mitchell is dodgy, but I don't think they can block that.
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'87 GN, 60lb, TA49, THDP, FTP cam, T+ lots o' shit - SOLD
'07 Ford F150 Lariat 2WD, 5.4L 3v - 255k
'20 Kubota BX2380. FEL, 60" deck
'78 IH/Case 184 Lo-Boy
'99 Kawasaki Bayou 400 4x4

Offline Charlief1

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F150 2 amp draw
« Reply #13 on: March 02 2011, 10:04:59 PM »
I don't have MS paint though.
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Offline $1987 GN$

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F150 2 amp draw
« Reply #14 on: March 02 2011, 10:08:57 PM »
Quote from: "SuperSix @ Wed Mar 02, 2011 9:01 pm"
Quote from: "Charlief1 @ Wed Mar 02, 2011 8:44 pm"
Lost me there Mark. The site has it's own PDF reader and you can't use anything else to open them with. The site blocks any attempt to copy images.


Pressing ALT and PrtScr keys at the same time does a screen capture of the active window. After that, open MS Paint. Pressing CTRL and V at the same time pastes the screen capture into Pain. Pressing CTRL and P at the same time opens up the print window.

Basically you can print anything you see on your screen. Mitchell is dodgy, but I don't think they can block that.


And if that fail, camera time.  lol

AJ___
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