Fuse #26 resets GEM after being idle - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 06-06-2012
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Fuse #26 resets GEM after being idle

2001 Ranger- when it sits for over 30 minutes the items controlled by the GEM (dome light, wipers, speedo, chime) do not work when I go to restart the truck. However when I pull and replace fuse #26 it resets and works fine. The fuse is not blown. I have replaced the GEM. Any suggestions?
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Old 06-06-2012
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Based on your list of effected components it sounds like a bad GEM. Was this the reason you replaced the GEM? Have there been any new components effected since replacing the GEM? Do the interior lights work when opening the doors before and or after resetting the GEM?
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Old 06-07-2012
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It did sould like the GEM and that is why I replaced it, but nothing changed. Then I read more and saw that fuse #26 controls the GEM, so it wouls be all the same symptoms.
Everything works after resetting fuse #26 which controls the GEM. It also controls the battery saver relay. Since this only seems to occur after the truck is sitting for 30 minutes or more, I'm thinking this relay may be faulty.
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Old 06-07-2012
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Quote:
Originally Posted by ggreen24502 View Post
It did sould like the GEM and that is why I replaced it, but nothing changed. Then I read more and saw that fuse #26 controls the GEM, so it wouls be all the same symptoms.
Yes, fuse 26 supplies primary power to the GEM, Battery Saver Relay, Interior Lamp Relay, and Interior Lamps. However, the wipers, speedo, and chime receive power from other fuses but are controlled by the GEM.

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Originally Posted by ggreen24502 View Post
Everything works after resetting fuse #26 which controls the GEM. It also controls the battery saver relay. Since this only seems to occur after the truck is sitting for 30 minutes or more, I'm thinking this relay may be faulty.
I believe the Battery Saver Relay only controls the interior lamps. The GEM simply provides a ground for the relay coil. When the GEM see's a signal from one of the door switches it grounds the Interior Lamp Relay coil activating the dome lights.

You might check the primary ground circuit at pin 2 on connector 2100a (Black wire with White stripe) at the GEM. With it unplugged it should read .2 ohms or less to chassis ground.
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