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Causes of Parasitic Power Draw?


cola72

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Jun 28, 2020
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Location
Utah
Vehicle Year
1989
Make / Model
Bronco II
Transmission
Automatic
Hey all, I'm fighting and electrical issue on my 89 B2 (2.9)

So I have a parasitic power draw on my battery ~300 mA. 150 of this was coming from the aftermarket stereo, which I am going to replace. However the remaining 150 mA appears to be coming from the EEC-IV. After pulling fuses I ended up at the EEC relay. When I pulled the relay the power draw remained, so I believe the relay is good. After looking at some wiring diagrams I saw that this relay provides power to the EEC-IV via a yellow/black wire. I disconnected this wire at the relay and BOOM, power draw disappeared.

Couple questions:

1) is 150mA typical ignition off power draw for an EEC-IV relay?
2) If not, how would I go about troubleshooting the exact source of the power draw.

(Draw test performed with multi-meter in series to battery
 


gaz

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U.S. Military - Veteran
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Location
Wa, Bremerton 98310
Vehicle Year
1987
Make / Model
Ford
Engine Size
87Ranger Endrigo 2.9l, 87BII Endrigo 4.0l
2WD / 4WD
4WD
Total Lift
Ranger 5" (2" suspension), BII 4" suspension
Total Drop
Ranger 5sp, BII A4LD
Tire Size
Ranger 33"/4:10LS, BII 29"/3:73LS
My credo
Deengineer until it is how Blue Oval should have sold it!!
cola:

Are you saying that your system has a 150mA load with the key and not running? Like overnight and is draining your battery?
 

lvwill

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Location
Las Vegas Nv.
Vehicle Year
2020
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ford
Engine Type
2.3 EcoBoost
Engine Size
2.3 Ecoboost
Transmission
Automatic
2WD / 4WD
2WD
Tire Size
265/65/17
I had a problem with my 92 and it was the glove box light.
Sounds kinda strange but who checks to see if the glove box light stays on after it's closed
 

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