Gem module replacement - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

 
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post #1 of 7 (permalink) Old 11-15-2019, 04:32 PM Thread Starter
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Gem module replacement

So after having my batteries drain over a 2 day period ,I started to look at the battery drain and I have a .5 amp continuous on the gem module. I have pulled interior lights and brake pedal switch connector and no change . Do these modules go bad internally? We did have a rotted windshield frame so it could of had water get to it.

2002 Excursion limited 4x4 v-code springs,Bilstein shocks,Red Head steering box,Sct X-3 with DP-Tunes,Glow shift Gauges, Hellwig rear sway bar,Firestone air bags on the rear,Silverline Stainless 4" exhaust (SOLD)


2003 Dodge Ram 2500 Qc 4x4
[email protected] filter,Silverline 4" exhaust,Autometer gauges,Smarty,Raptor 150 (Sold)


2001 Ford Excursion Limited 4x4 Firestone airbags ,190 amp alternator ,mbrp 4" exhaust( My old Silverline sounded better) Dp Tuner F5 chip,Glowshift gauges ,Kenwood double din /nav radio,Ford AIS intake


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post #2 of 7 (permalink) Old 11-15-2019, 05:16 PM
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It's possible that the GEM has been damaged by water intrusion. If you do replace the GEM, you'll need to get the replacement programmed to match the old one.

A maximum 50mA draw with all the modules asleep is normal. That's 1/10 of what you're seeing. Are you sure that you've checked with modules asleep? The way to do that is to leave the door open till the interior lights go off, then check the draw. If you interrupt power connecting your meter, the modules will wake up and draw more power.

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post #3 of 7 (permalink) Old 11-16-2019, 09:15 AM Thread Starter
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I had the door shut and the reading never changed after more than 1/2 hr.

2002 Excursion limited 4x4 v-code springs,Bilstein shocks,Red Head steering box,Sct X-3 with DP-Tunes,Glow shift Gauges, Hellwig rear sway bar,Firestone air bags on the rear,Silverline Stainless 4" exhaust (SOLD)


2003 Dodge Ram 2500 Qc 4x4
[email protected] filter,Silverline 4" exhaust,Autometer gauges,Smarty,Raptor 150 (Sold)


2001 Ford Excursion Limited 4x4 Firestone airbags ,190 amp alternator ,mbrp 4" exhaust( My old Silverline sounded better) Dp Tuner F5 chip,Glowshift gauges ,Kenwood double din /nav radio,Ford AIS intake


2018 Dodge Ram 3500 Laramie STOCK
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post #4 of 7 (permalink) Old 11-20-2019, 09:15 AM Thread Starter
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After a exhaustive search for this drain on my batteries ,it turns out I have one bad battery and was drawing the other one down over nite. I brought both batteries and alternator and had them load tested at a chain store and both batteries showed good . I pulled the fuse box,Gem module out to look for corrosion/water marks and it was clean . It wasn't until my Dad suggested trying to start the truck off each battery individually to load test them did I find it. So check your batteries even when they say they are good from a parts store. So hopefully that's the end of my issues.

2002 Excursion limited 4x4 v-code springs,Bilstein shocks,Red Head steering box,Sct X-3 with DP-Tunes,Glow shift Gauges, Hellwig rear sway bar,Firestone air bags on the rear,Silverline Stainless 4" exhaust (SOLD)


2003 Dodge Ram 2500 Qc 4x4
[email protected] filter,Silverline 4" exhaust,Autometer gauges,Smarty,Raptor 150 (Sold)


2001 Ford Excursion Limited 4x4 Firestone airbags ,190 amp alternator ,mbrp 4" exhaust( My old Silverline sounded better) Dp Tuner F5 chip,Glowshift gauges ,Kenwood double din /nav radio,Ford AIS intake


2018 Dodge Ram 3500 Laramie STOCK
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post #5 of 7 (permalink) Old 11-21-2019, 02:04 AM
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Thanks for closing the loop on this.
Batteries always need to be load tested individually. Your Dad's starter test was a quick and dirty way to do that. Good suggestion.

First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
'99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version
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post #6 of 7 (permalink) Old 11-21-2019, 09:15 AM Thread Starter
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That's the weird thing, I brought each battery in and put them on the counter of the parts store. Both tested good.

2002 Excursion limited 4x4 v-code springs,Bilstein shocks,Red Head steering box,Sct X-3 with DP-Tunes,Glow shift Gauges, Hellwig rear sway bar,Firestone air bags on the rear,Silverline Stainless 4" exhaust (SOLD)


2003 Dodge Ram 2500 Qc 4x4
[email protected] filter,Silverline 4" exhaust,Autometer gauges,Smarty,Raptor 150 (Sold)


2001 Ford Excursion Limited 4x4 Firestone airbags ,190 amp alternator ,mbrp 4" exhaust( My old Silverline sounded better) Dp Tuner F5 chip,Glowshift gauges ,Kenwood double din /nav radio,Ford AIS intake


2018 Dodge Ram 3500 Laramie STOCK
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post #7 of 7 (permalink) Old 11-21-2019, 12:30 PM
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Originally Posted by BlueOx1 View Post
That's the weird thing, I brought each battery in and put them on the counter of the parts store. Both tested good.

It happens. Even the fancy battery tester that Ford requires us to use passes batteries that for whatever reason fail to hold a charge.


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