I have a battery drain of 4.2 amps. I have pulled all fuses and relays from the battery junction box and all the fuses and connectors from the fuse block under the dash and the main terminal connector there as well, There is no change in the current draw. I have the BJB isoltted when performing this. Where else should I look?

What ? jb power fuse ? Why don't you say what jb is ? I'm assuming you mean junction box . Were not mind readers ! Regardless you have a parasitic draw on one of the circuits in the junction box , Hook up a amp meter between the negative battery post an negative battery cable . Shouldn't have more then 50 milliamp draw . Pull the fuse's one at a time till the drain goes away . Look at a wiring diagram for that circuit to see what all is on it . isolate an fix . Videos on youtube showing how to trouble shoot ! How To Perform Parasitic Draw Test EricTheCarGuy

Visual Inspection Chart Mechanical Electrical

• Door window regulator and motor
• Door glass top run
• Door window glass

• Loose, corroded connectors
• Circuitry
• Window control switch
• Battery junction box (BJB) fuse(s):
  • 1 (60A)
  • 3 (60A)
  • 11 (50A)
• Smart junction box (SJB) fuse(s):
  • 7 (20A)
  • 27 (10A)
  • 30 (10A)
• SJB circuit breaker 10 (30A)
• SJB rear window defrost relay 1
• Relay center box 1 rear window defrost relay 2
• Delayed accessory relay
• Battery saver relay
• Rear window defrost grid

Visual Inspection Chart Mechanical Electrical

• Door window regulator and motor
• Door glass run
• Door window glass

• Loose, corroded connectors
• Circuitry
• Window control switch
• Battery junction box (BJB) fuses:
  • 29 (80A)
  • 30 (30A)
• Smart junction box (SJB) fuses:
  • 15 (10A)
  • 25 (30A)
• SJB circuit breaker
• SJB heated backlight relay
• Delayed accessory relay
• Battery saver relay
• Heated backlight grid

It is located in the SJB smart junction box , it's a fuse / relay center / microprocessor ! Fuse # F2.10 30 amp . location -behind left side dash panel . Also check the accessory relay . Top relay left side , same location SJB .
Visual Inspection Chart Mechanical Electrical

• Door window regulator and motor
• Door glass top run
• Door window glass

• Loose, corroded connectors
• Circuitry
• Window control switch
• Battery junction box (BJB) fuse(s):
  • 1 (60A)
  • 3 (60A)
  • 11 (50A)
• Smart junction box (SJB) fuse(s):
  • 7 (20A)
  • 27 (10A)
  • 30 (10A)
• SJB circuit breaker 10 (30A)
• SJB rear window defrost relay 1
• Relay center box 1 rear window defrost relay 2
• Delayed accessory relay
• Battery saver relay
• Rear window defrost grid

You have a short somewhere in electrical system of truck that is slowly draining battery. When battery is too low, cranking speed and voltage is too low to operate electrical system to allow fuel etc to start truck. First make sure dome light is not staying on after you close door. Sometimes a kneecap hits the dash switch that turns on domelight. Second make sure battery is FULLY charged. Have auto store check battery to see if it is fully charging. At same time they will check to see if alternator is not malfunctioning and charging correct amount. Replace as needed. If all checks out OK...Third, get an amp meter, remove negative battery cable. Attach one probe to the negative cable and other to negative post on Battery. Turn amp meter on. It should read zero. If reads anything it is showing you have short in system. With meter hooked up this way(I use radiator clamps to secure probes to post and cable) Start pulling fuses first, one at a time, then relays in fuse box to until meter goes to zero. When goes to zero you have found the circuit. Look at fuse box picture in owners manual that came with truck. Replace relay or relay connected to the circuit shown in manual. For instance if fuse you pulled to make it go to zero...says it is for wipers and windows...look at manual diagram and locate and replace relay for wiper or windows one at a time, then check amp meter to see if battery drain continues...If you can't locate source of problem you have at least identified circuit. You can get all data schematics at library from ALLDATA free....then try to track down further...if not able to do yourself take to GOOD auto shop that does electrical work. OR.....buy at hardware, auto parts store or Wal Mart....Red wire at least 6ft long. one Toggle switch, get inline fuse connector and a matching fuse that matches the fuse you pulled out that makes amp meter go to zero( If 5 amp, get tubular 5 amp fuse for inline connector)...buy electrical wire connectors kit. Make two 3 ft long wires. Put connector onto both wires and screw tight onto toggle switch. Now cut one wire in half and splice inline fuse onto that wire with connectors. Next make a one prong connector for each end of wire. Carefully make it so you can plug one connector of wire into the left side of where fuse used to plug into fuse box. Then plug in other wire into right side of where fuse use to connect when plugged into fuse box. use electrical tape if need be so they cannot short across these two wires. Check with amp meter on neg cable and negative batt post to see if meter shows drain. If shows drain... simply switch toggle switch off. Meter should be at zero with toggle switch one way, then shows drain with other. Secure wires with plastic tie straps electrical tap, and duct tape the toggle switch to lower dash board area you can reach while driving. If your wipers or windows etc, aren't working with switch shutting off drain, simply turn on when needed and shut off when you park truck. Recheck with amp meter again when all secure...Good luck all!

Here is the information I have concerning the power points on your vehicle:

Fuse 15 Battery Junction Box (20 Amp) = rear power point
Fuse 17 Battery Junction Box (20 Amp) = console power point
Fuse 9 in Smart Junction Box = dash power point
Fuse 9 gets its power from fuse 29 - Battery Junction Box (80 Amp)
Fuses 15 and 17 above have direct battery connections.

Make sure you are looking in the correct fuse box for each fuse. The Battery Junction Box is under the hood. The Smart Junction Box is under the left side of the dash. The fuses may "look" ok and can still be blown. You need to test for power at the fuse with a test light. All of the fuses listed above should be HOT AT ALL TIMES - meaning, you do not have to turn on the ignition switch to get power to them.

Also, are you sure that all the power points are not working? or are you just trying the same piece of equipment in all 3 of them? If this is the case, the piece of equipment that you are pluging into them could be the problem instead of the power points. Since all 3 of the power points are on separate circuits, I think it very unlikely that all the fuses would be blown unless you have plugged a defective/shorted piece of equipment into all 3 of them. There is nothing else that could cause this that would make all 3 of them go out at the same time.

A 50 AMP fuse is a main power fuse. This is not "isolated" that thing probably feeds 5 or more other circuits. You need to get the power distribution diagrams and narrow it down further by pulling the fuses (NOT RELAYS) that are fed by that fuse. Once you have it narrowed down to a single (small) fuse, then you narrow it further by checking the circuits that are fed by that fuse. You must check everything that is fed by the small fuse. The easiest way is using the power distribution diagrams to unplug all of the components (one at a time) that are powered by that fuse. Sometimes you can eliminate two or three components at a time by disconnecting a single, common connector.

Check Fuse 2.3 (20 Amp). See electrical diagram below.

When it goes, it'll take out the audio and "Cluster and Panel Illumination."
(assuming your vehicle doesn't have an OEM Nav system - in which case fuse 2.3 would
supply power to the Nav system).

Fuse 2.3 is located in the CJB (Central Junction Box) - not the BJB (Battery Junction Box),
nor the AJB (Auxiliary Junction Box).

Also, check fuses F1.6 (60 Amp), and fuse F1.62 (30 Amp) in BJB (Battery Junction Box).
Also, check fuse F2.17 (15 Amp) and the "Accessory Delay Relay," both in the CJB (Central
Junction Box).





Here's the electrical diagram for 2005 Mercury Mountaineer Power Windows:
Note how fuses F1.6, F1.62, F2.17, and 'Accessory Delay Relay" will all
disable the power windows.

It sounds like something is drawing power with the key off. It could be the GEM module but I doubt it. There is a draw somewhere. Connect battery and pull fuses one at a time to see if curent drain stops. You will need an ampmeter in series with the battery and the postive cable. Expensive. Get one from pick n pull salvage yard real cheap.

Check the following fuse junction panel fuses: fuse 23 (5A), fuse 20 (5A), and fuse 8 (5A).

Section 13-09A: Gauges/Warning Devices, Chime/Buzzer System 1998 Taurus/Sable Workshop Manual REMOVAL AND INSTALLATION Procedure revision date: 03/16/1998
Generic Electronic Module (GEM) Removal
The generic electronic module (GEM) is connected to the rear of the fuse junction panel (14A067) .

1. Disconnect battery ground cable (14301) . Refer to Section 14-01.
   

1. Remove two nuts retaining fuse junction panel to dash panel (01610) .
   

1. Pull upper ears of fuse junction panel down out of retaining bracket.
   

1. Disengage locking tangs and disconnect three harness connectors from bottom of GEM.
   

1. Turn fuse junction panel over and remove screw retaining GEM to fuse junction panel .
   

1. Disconnect and remove GEM from fuse junction panel .
   

Installation

1. Follow removal procedure in reverse order.
   

1. Tighten GEM to fuse junction panel screw to 1-2 Nm (9-17 lb-in).
   

1. Tighten fuse junction panel retaining nuts to 4-6 Nm (36-53 lb-in).
   
   
   
   
   
   Item Part Number Description 1 14B205 Generic Electronic Module (GEM) 2 - Mounting Ear (Part of 14A067) 3 14A067 Fuse Junction Panel 4 - Screw (Part of 14A067) 5 - Generic Electronic Module (GEM) to Fuse Junction Panel Connector A - Tighten to 1-2 Nm (9-17 Lb-In)

For the rear wiper fuse 12 10 amp in the battery junction box and fuse 11 15 amp in the central junction box. For the speed control fuse 7 20 amp battery junction box, fuse 13 20 amp central junction box fuse 5 15 amp central junction box. I hope this helps and good luck