Battery draining too fast

Tiny
LINSRUNN
  • MEMBER
  • 2004 FORD FREESTAR
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Hi,

I have a problem with the power consumption. When everything is off, it consumes 0.38 amps. The normal is rather 0.05 amps. I changed the battery and the problem is still present. By doing several tests, I reduced the problematic circuits to 3 fuses: F-58, F-65 and F-67

F-58: SJB #1 - Center High-Mounted Stop Lamp (CHMSL), License plate lamps, OBD II, Dome lamp, Auxiliary blend doors, Switch illumination (feeds F-8, F-9, F-10 and F-11).
F-65: SJB #2 - Left cornering/auxiliary lamps, Left low beam, Right front park/turn lamps, Right rear park/stop/turn lamps, Puddle lamps, Mirror signals, Visors, 2nd and 3rd row lamps, Cargo lamp, Defroster indicator.
F-67: Ignition switch #2 feed.

I did two tests:

Test 1
Door is close. Everything is off.
Consumption: 0.38 amp
I take off F-58
Consumption: 0.38 amp
I put the F-58 back
Consumption: 0.38 amp
I take off F-65
Consumption: 0.38 amp
I put the F-65 back
Consumption: 0.38 amp
I take off F-67
Consumption: 0.23 amp (!)
I put the F-67 back
Consumption: 0.38 amp
Conclusion: The F-67 fuse circuit consumes 0.15 amps.

Test2
Door is close. Everything is off.
Consumption: 0.38 amp
I take off F-58, F-65 and F-67
Consumption: 0.05 amp (normal consumption)
I put the F-65 back
Consumption: Consumption alternates between 1.60 amps and 0.58 amps every 10 seconds without stopping.
I take off F-65
Consumption: 0.05 amp
I put the F-58 back
Consumption: consumption alternates between 1.70 amps and 0.57 amps every 10 seconds without stopping.
I take off F-58
Consumption: 0.05 amp
I put the F-67 back
Consumption: 0.20 amps (fuse F-67 consumes 0.15 amps as in the first test)
I take off 67
Consumption: 0.05 amp
I put back F-58, F-65 and F-67
Consumption: Consumption alternates between 1.67 amps and 0.72 amps every 10 seconds without stopping. To stop it, I had to put the key in the ignition and turned on and then off.
Final consumption: 0.38 amp

Note: For each fuse manipulation, I wait 2 min before taking the amperage reading.

What should be the next step? I know there is a problem with fuse 67. But there is also strange behavior with fuse 58 and 65. Any suggestions are welcome.
Sunday, November 29th, 2020 AT 7:16 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

You are on the right path.

Fuse 58 is a problem since it controls so much. I attached a diagram of what it controls. You will need to remove the fuses it controls one by one to see if you can get the milliamps down to 50 to 75.

https://www.2carpros.com/articles/car-battery-dead-overnight

https://www.2carpros.com/articles/how-to-check-wiring

If all the fuses out for 58 and it still has the drain, good chance the SJB is the issue itself.

Roy

SMART JUNCTION BOX (SJB)

REMOVAL

1. CAUTION:
- Prior to the removal of the module, it is necessary to upload module configuration information to the appropriate diagnostic equipment. This information needs to be downloaded into the new module once installed.
- Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage may result.

Disconnect the battery.

2. Remove the LH dash closeout panel.

imageOpen In New TabZoom/Print

3. Remove the parts in the order indicated in the illustration and table.

Item 4: Smart Junction Box (SJB) Removal Note
1. Position the SJB forward to allow access to the wiring harness connectors on the rear face of the SJB.

INSTALLATION
1. To install, reverse the removal procedure.

Item 4: Smart Junction Box (SJB) Installation Note
1. Once the SJB is installed, it is necessary to download the module configuration information from the diagnostic tool into the new module.

Item 7: Smart Junction Box (SJB) Installation Note
1. Make sure the coaxial connector is connected, or the remote keyless entry (RKE) system will experience diminished range.

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Monday, November 30th, 2020 AT 2:59 AM

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