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Author Topic: F150 2 amp draw  (Read 17130 times)

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Offline daveismissing

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F150 2 amp draw
« Reply #15 on: March 02 2011, 11:38:23 PM »
No fancy dimming here, basic truck AM/FM/cassette+ AC
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Offline Charlief1

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F150 2 amp draw
« Reply #16 on: March 03 2011, 12:15:16 AM »
Is the battery light on when the engine's off Dave? That's what that circuit does so the light should be on if it's getting power.
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Offline daveismissing

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F150 2 amp draw
« Reply #17 on: March 03 2011, 08:47:01 AM »
Quote from: "Charlief1 @ Thu Mar 03, 2011 12:15 am"
Is the battery light on when the engine's off Dave? That's what that circuit does so the light should be on if it's getting power.

Yes, KEY-ON battery indicator illuminated, RUNNING- battery indicator off
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Offline daveismissing

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Re: F150 2 amp draw
« Reply #18 on: March 03 2011, 09:03:38 AM »
Dunno where I got this one, I think the Haynes matched color codes better but this seems right from a block diagram view

Is this consistent with yours?
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Offline Charlief1

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F150 2 amp draw
« Reply #19 on: March 03 2011, 01:23:42 PM »
Not even close Dave. Mitchell is much more detailed.

I was talking about with the key off not on.
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Offline SuperSix

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F150 2 amp draw
« Reply #20 on: March 03 2011, 01:53:32 PM »
Quote from: "Charlief1 @ Thu Mar 03, 2011 1:23 pm"
Not even close Dave. Mitchell is much more detailed.

I was talking about with the key off not on.


I was wondering that too - Even a dull glow??
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Offline daveismissing

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F150 2 amp draw
« Reply #21 on: March 03 2011, 03:33:26 PM »
OK, I see what you guys are going.

Not enough current flows in the reverse direction to light the bulb.
Not all the resultant draw happens thru that wire.

It "appears" like enough reverse bias current flows out of the regulator to positively bias something in the regulator cct itself and drawing current.
(told you it was strange)
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Offline Charlief1

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F150 2 amp draw
« Reply #22 on: March 03 2011, 04:04:14 PM »
Are you sure it's in the reverse direction Dave?  Take the fues out and test both sides where the fuse plugs in and see if both sides have power with the key off.

What's the amp draw you're getting?
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Offline Pyro6

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Re: F150 2 amp draw
« Reply #23 on: March 03 2011, 06:37:31 PM »
My luck isn't so good here lately, but was just wondering how you measured your 2A draw and did you already pull fuses to isolate?
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Offline Pyro6

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Re: F150 2 amp draw
« Reply #24 on: March 03 2011, 06:47:18 PM »
Just a side note, since I posted I just now got page one of the post. Anybody else have this happen? Plus I hope he gets the truck fixed. We may have fun driving the Buicks but keep the DD's running.
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Offline daveismissing

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F150 2 amp draw
« Reply #25 on: March 03 2011, 08:28:44 PM »
I do have a work-around. I currently have relay contacts in series with that #19 fuse. Truck turns off, relay drops out, draw goes away.

Pyro:
Yes pulling that fuse makes the draw go away.
The ammeter gets inserted in series with the battery while isolating.You can separate stuff easily around those "master" fuse terminals.

The alternator got changed because disconnecting it  also made the draw go away (logical). You can measure the resistance to ground as well as voltage from battery+ and battery- to the wire in question to figure what going on.

Overall Its not the kind of conclusion that leaves you comfortable, like say finding a broken mechanical part.

 Was hoping Charlie or Steve or Ed might come up with common failures that might fit the oddball symptoms...
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Offline daveismissing

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F150 2 amp draw
« Reply #26 on: March 03 2011, 08:40:12 PM »
Quote from: "Charlief1 @ Thu Mar 03, 2011 4:04 pm"


Are you sure it's in the reverse direction Dave?


Definitely- seemed absurd so multiple checks

Quote from: "Charlief1 @ Thu Mar 03, 2011 4:04 pm"

Take the fues out and test both sides where the fuse plugs in and see if both sides have power with the key off.

 
ignition switch side of fuse block, fuse removed:
key on - a nice 12v
key off - 0 volts to ground  12 volts to battery+

Quote from: "Charlief1 @ Thu Mar 03, 2011 4:04 pm"

What's the amp draw you're getting?


2.5amps
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Offline Charlief1

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F150 2 amp draw
« Reply #27 on: March 03 2011, 10:10:30 PM »
Change the ignition switch Dave. My best is that the contacts in the switch has gotten funky. Guessing that it's got around 130K or more on the clock now?
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Offline daveismissing

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F150 2 amp draw
« Reply #28 on: March 03 2011, 10:36:23 PM »
Prolly closer to 170K :)
Maybe more if I drive down and visit supersix in a week :)
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Offline daveismissing

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Re: F150 2 amp draw
« Reply #29 on: October 30 2013, 09:06:38 PM »
So I got two whole years out of that rebuilt alternator (one year warranty)
Crapped out, they wanted as much for a regulator as the whole thing.
.
Idiot battery light stay on tho it's charging now. tried another better alt (bosch),
 still the same.


Can anyone confirm that bulb only goes to the "I" terminal of the reg?
If the circuit went open the light should go out. Makes not much sense.
 
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