EEC draining battery - Ford Mustang Forum
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post #1 of 13 (permalink) Old 4 Weeks Ago Thread Starter
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EEC draining battery

Hello. Iím a newbie to the sight and need some help. I just purchase an 89 gt convertible that Iím planning on turning into a Resto mod. Iím first trying to take care of some what I thought were minor issues. My stang had some parasitic draws on the battery. One was the voltage regulator and /or alternator. I was planning on upgrading anyway. The other that I found was a corroded door switch on the driver side. I still have one more that I canít seem to isolate. Here is what I know. All lights disconnected and key removed from ignition. Dash and cluster removed. Iím getting a 4.5 amp draw on unfused wire going to eec from the hot side of the solenoid. When I unplug the eec , the draw goes away. When I bought the car it ran great. I donít know if itís the eec or something down the line connected to it. Iíve unplugged everything (I think) connected to the eec. I did remove the eec and look inside for obvious burnt components and none were found. Any help will be appreciated thanks.

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post #2 of 13 (permalink) Old 4 Weeks Ago
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Your onboard computer wouldn't have that much current draw. You'll probably have to dig out a wiring diagram to make sure you have everything unplugged. Worst case, you have a chafed wire somewhere. Back probing the harness connector might give you some idea of the circuit in question.

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Welcome to the site!! I moved your thread to the correct forum for better results.


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post #4 of 13 (permalink) Old 4 Weeks Ago Thread Starter
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Thanks for the help. To narrow down the problem. Does anyone know what items have power through the eec when the car is off. I have a schematic of the wiring for the car but it shows the computer as solid state. I see everything that’s connected to the eec but most things are powered when the key is on. Thanks again for the help.
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post #5 of 13 (permalink) Old 4 Weeks Ago
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Through the EEC? I dont believe anything. Only thing in the EEC powered that im aware of is the KAM. Everything else kept alive with key off are run through separate circuits.

90 LX 5.0 5spd
14į of initial timing on 93 octane
Ported 93 Cobra Intake Manifold -- BBK 75mm TB
FRPP shorties -- BBK O/R X
Spintech Prostreets -- 2.5in Flowmaster Tails
Hurst Billet Plus Shifter -- BBK CAI
FRPP 3.73s -- Walbro 190lph
3G alt -- Contour Fans -- '92 Premium Radio w/ EQ
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post #6 of 13 (permalink) Old 4 Weeks Ago Thread Starter
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Thanks Krem12. Forgive me but what is KAM? Also. If nothing is powered through the eec when the car is not running and key out then wouldn’t the conclusion be a bad eec if it’s drawing 41/2 amps. Thanks.
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Originally Posted by Zabby View Post
Thanks Krem12. Forgive me but what is KAM? Also. If nothing is powered through the eec when the car is not running and key out then wouldnít the conclusion be a bad eec if itís drawing 41/2 amps. Thanks.
Keep alive memory. It stores your fuel trims from closed loop control. Do you know what pin on the ecu this amp draw is at? Pin 1 is the pin that always has 12v and is for KAM.

90 LX 5.0 5spd
14į of initial timing on 93 octane
Ported 93 Cobra Intake Manifold -- BBK 75mm TB
FRPP shorties -- BBK O/R X
Spintech Prostreets -- 2.5in Flowmaster Tails
Hurst Billet Plus Shifter -- BBK CAI
FRPP 3.73s -- Walbro 190lph
3G alt -- Contour Fans -- '92 Premium Radio w/ EQ
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post #8 of 13 (permalink) Old 4 Weeks Ago Thread Starter
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Ok. Thanks for clarifying. I did power up the eec while it was out of the car using pin 1 and 20. 1 being hot. It did read 4.5 amps at first then reduced to I think around .2. I donít know of a way to test what wire is drawing the amps without cutting, testing then splicing back together. I hunk if I did that it may cause more issues in the future. Thanks
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post #9 of 13 (permalink) Old 4 Weeks Ago Thread Starter
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I still can’t find the drain. Anybody have any ideas. Thanks
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post #10 of 13 (permalink) Old 4 Weeks Ago
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Are you waking up to a dead battery every morning?
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post #11 of 13 (permalink) Old 4 Weeks Ago Thread Starter
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Yes. Iíve traced it to the eec. It draws 4.5 amps when car is off and key is removed. What I donít know is does the eec power anything when the car is off or do I have a bad eec. Thanks
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post #12 of 13 (permalink) Old 4 Weeks Ago Thread Starter
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Boy do I feel dumb

Well. I found the problem. It was me. I had the meter on the wrong setting. Itís a new meter and Iím not use to it yet. I had it on micro amps. So once I figured that out I hooked everything back up and it all good. Thanks to everyone that tried to help. Hopefully someday I can return the favor. Thanks
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post #13 of 13 (permalink) Old 4 Weeks Ago
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Quote:
Originally Posted by Zabby View Post
Well. I found the problem. It was me. I had the meter on the wrong setting. It’s a new meter and I’m not use to it yet. I had it on micro amps. So once I figured that out I hooked everything back up and it all good. Thanks to everyone that tried to help. Hopefully someday I can return the favor. Thanks
Good deal. So... Uhh.. You weren’t waking up to a dead battery every morning after you replaced the battery, etc?
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