Thanks for the add here ,
I have 2002 f150 lariat 4x4 , 4 door , I turn truck off , abs light, 4x4 light , and 2 others stay on , also odometer reading goes to all dashes ,and heater will run full bore while driving the radio won't work , but works while in park running , 4x4 light also blinks on and off and you can hear relays clicking on and off . I've had 3 different people tell me 3 different things , either gem module or instrument panel , 150 , southern truck , no rust what so ever , I took apart to get at gem , no signs of water or anything corrosive , help please

 

Check relays

 

That really sounds like the GEM. Well, go over all the grounds first.

Do you know where they are?

 

Thanks , I know the chassis / cab ground , not other ones , will check relays ,

 

Where are the other grounds?

 

Passenger side fender under hood, passenger side kick panel. Those are known culprits.

 

Damn ghost strike again!!!

 

GEM taking a dump it sounds like. Has it been wet where you are at? That is the common culprit with these trucks. Good luck.

 

Thanks guys , ya been wet here in n.h. , rained just before this problem happened last 2 times , took gem out . Looked dry and good but noticed wetness above on a bar , used a hairdryer for an hour on gem and fuse box , sealed around top of windshield with silacone , harsh way of doing it but funds are low at moment , everything back to normal now , maybe I lucked out , thanks again for replys , great site you have here , lots of help