I have residual current draw on 1996 Ford Explorer. I traced it to fuse #25 (Speedometer and Gem System). Which is most likely? Can I (with battery disconnected) disconnect Gem, then reconnect battery to see if current draw gone? Any other ideas? Anyone seen this problem? Thanks for your help.

Vehicle Speed Signal
The vehicle speed signal is generated by the rear anti-lock brake sensor and sent to the 4-wheel anti-lock brake system (4WABS) module. The 4WABS module sends the vehicle speed signal via circuit 679 (GY/BK) to all systems which require a vehicle speed signal input.
Speedometer
The electronic speedometer receives a speed signal from the 4WABS module.
GEM/CTM Diagnostic Trouble Code (DTC) Index
GEM/CTM Diagnostic Trouble Code (DTC) Index DTC Description DTC Caused By Action P0500 Vehicle Speed Signal Circuit Failure GEM REFER to Section 308-07A . Take your vehicle an have it diagnosed , before you buy parts you don't need . Just a suggestion , could be a wiring problem , the speedometer gauge , computer etc...

I would try a known good battery first. A marginal one will cause this type of problem. You can use the parasitic draw current and calculate your battery life. To do this you need to take into account all the parasitic current loads. Also it may take an hour for all loads to shut off completely. Be sure your GPS in disconnected. Disconnect each of the loads one at a time to find out which output is the culprit. This is a very difficult way of doing it but without the proper current measuring tools it is about the only way. When all loads are disconnected and it keeps on drawing then it is the GEM module itself assumning that is the line you are measuring. Not all replacements are good.

GEM stands for General Electronic Module and controls a lot of non engine related things, such as power windows and locks. I had a 2000 ranger the other week I was working on with a bad one. To correctly test the GEM you need to hook up an amp meter to see the current draw. It takes the GEM about an hour to full power down. If your just sticking a test light on it, it may be miss leading you. Try hooking your test light up like you was testing and leave it like that for an hour without messing with the car, to see if the light is still lite. The best honest way to test is with an amp meter though. Should have .05 amps or less on it after an hour, anything more than that is a bad GEM.

The GEM in the ranger had to be programed by the dealer.

Generic electric moduel it mostly controls your speedometer. But if it keep on not doing right and no wiers are touching test them first make sure you dont have problem there. than yes change it

There are no codes for this. The issue may be that the gem is getting a driver door open signal or the gem itself is bad. I got a used gem at a salvage yard for $20 recently, but make sure its not the door switch first. You can pull the connector off the switch and use an ohmmeter to see if the wire is grounded. If it is, trace it to the gem to find where it is getting cut into.

Check cells in the battery, may be one or more low cells needing to be topped with acid.

Thanks for the inquiry.







Fuse Numbers and Locations:
EXPLORER FUSE PANEL Fuse Position Rating Circuit Protected 1 10 Amp Power Mirrors/Antenna 2 10 Amp Air Bag/Blower Relay 3 15 Amp Parking Lamps 4 15 Amp Left Headlamp 5 10 Amp On Board Diagnostic II System 6 15 Amp HO2S Sensors 7 10 Amp Illumination Switches 8 15 Amp Right Headlamp/Fog Lamp System 9 10 Amp EATC Mem./Seat Mem./Mess. Ctr./Cell. Phone 10 10 Amp EATC Sys./Rear Blower/Spd. Control/GEM Sys./Brake Interlock/OH Console Adapt. Susp. 11 10 Amp Warning Lamps 12 10 Amp Front and Rear Washers 13 15 Amp PCM Sys./Stoplamps/4WD/
ABS/Spd. Control/Trailer Tow 14 10 Amp Anti-Lock System 15 15 Amp Air Bag System/Alternator 16 30 Amp Front Wiper 17 30 Amp Cigar Lighter 18 15 Amp A/C System 19 25 Amp Ignition Coil/PCM System 20 10 Amp Radio/Power Ant./GEM Sys./Anti-Theft/Cell. Phone 21 15 Amp Hazard Lamps 22 15 Amp Turn Signals 23 15 Amp Rear Wiper System 24 15 Amp Starter Relay/Anti-Theft 25 10 Amp Speedometer/GEM System 26 15 Amp A4LDE Trans/DRL Sys./Backup Lamps/4WD/Rear Defroster 27 15 Amp Under Hood LP/Map Lights/Glove Box Lamp/Dome Lamp/Visor Lamps/Accessory Delay/DR Switch Illum./4x4 System 28 10 Amp Memory Seat/GEM System 29 15 Amp Audio System 30 - Not Used 31 10 Amp Aux. Blower System 32 10 Amp Heated Mirrors/Heated Backlite 33 20 Amp High Beam Lamps 34 10 Amp Audio System/Power Antenna 35 - Not Used 36 - Not Used
Hope this helps helps. Please keep us updated and remember to rate this answer.
Kind regards,
TF

See Below.

Hope this helps.

Zeppelinx12


Fuse Panel, Explorer






EXPLORER FUSE PANEL Fuse Position Rating Circuit Protected 1 10 Amp Power Mirrors/Antenna 2 10 Amp Air Bag/Blower Relay 3 15 Amp Parking Lamps 4 15 Amp Left Headlamp 5 10 Amp On Board Diagnostic II System 6 15 Amp HO2S Sensors 7 10 Amp Illumination Switches 8 15 Amp Right Headlamp/Fog Lamp System 9 10 Amp EATC Mem./Seat Mem./Mess. Ctr./Cell. Phone 10 10 Amp EATC Sys./Rear Blower/Spd. Control/GEM Sys./Brake Interlock/OH Console Adapt. Susp. 11 10 Amp Warning Lamps 12 10 Amp Front and Rear Washers 13 15 Amp PCM Sys./Stoplamps/4WD/
ABS/Spd. Control/Trailer Tow 14 10 Amp Anti-Lock System 15 15 Amp Air Bag System/Alternator 16 30 Amp Front Wiper 17 30 Amp Cigar Lighter 18 15 Amp A/C System 19 25 Amp Ignition Coil/PCM System 20 10 Amp Radio/Power Ant./GEM Sys./Anti-Theft/Cell. Phone 21 15 Amp Hazard Lamps 22 15 Amp Turn Signals 23 15 Amp Rear Wiper System 24 15 Amp Starter Relay/Anti-Theft 25 10 Amp Speedometer/GEM System 26 15 Amp A4LDE Trans/DRL Sys./Backup Lamps/4WD/Rear Defroster 27 15 Amp Under Hood LP/Map Lights/Glove Box Lamp/Dome Lamp/Visor Lamps/Accessory Delay/DR Switch Illum./4x4 System 28 10 Amp Memory Seat/GEM System 29 15 Amp Audio System 30 - Not Used 31 10 Amp Aux. Blower System 32 10 Amp Heated Mirrors/Heated Backlite 33 20 Amp High Beam Lamps 34 10 Amp Audio System/Power Antenna 35 - Not Used 36 - Not Used

The gem is shorted out replace it.

RANGER FUSE PANEL Fuse Position Rating Circuit Protected 1 7.5 Amp Power Mirror 2 — Not Used 3 15 Amp Parking Lamps 4 10 Amp Left Headlamp 5 10 Amp On Board Diagnostic (OBD) II System 6 7.5 Amp Air Bag System/Blower Relay 7 7.5 Amp Illumination Switches 8 10 Amp Right Headlamp/Fog Lamp System 9 10 Amp ABS System 10 7.5 Amp Speed Control/GEM System/Brake Interlock 11 7.5 Amp Warning Lamps 12 10 Amp Front Washer System 13 15 Amp PCM System/Stoplamps/
4WD/ABS/Speed Control 14 10/20 Amp ABS System 15 7.5 Amp Air Bag System/Alternator 16 30 Amp Front Wiper 17 15 Amp Cigar Lighter 18 15 Amp A/C System 19 25 Amp Ignition Coil/PCM System 20 7.5 Amp Radio/GEM System/Anti-Theft 21 15 Amp Hazard Lamps 22 10 Amp Turn Signals 23 — Not Used 24 10 Amp Starter Relay/Anti-Theft 25 7.5 Amp Speedometer/GEM System 26 10 Amp 4R44E/4R55E Trans./Backup Lamps/DRL System 27 10 Amp Underhood LP/Map Lights/Glove Box Lamp/Dome Lamp/Visor Lamps/4x4 Sys. 28 7.5 Amp GEM System 29 10 Amp Audio System 30 — Not Used 31 — Not Used 32 — Not Used 33 15 Amp High Beam Lamps 34 — Not Used