Electrical serious problems Need advice !!
Thread Starter
Senior Member
Joined: Dec 2009
Posts: 963
Likes: 2
From: Lake Lafayette ,Mo
Electrical serious problems Need advice !!
I'm working on an 03 supercrew . It won't start . Windows don't work , Radio don't work .Keeps blowing fuses .
Fuse # 18 under hood = powertrain control module, fuel injectors, fuel pump relay, mass air flow sensor
Fuse # 104 under hood = central junction box
Fuse #1 under dash = audio
Fuse # 3 under dash = cigar lighter, data link connector
Fuse # 15 under dash = stop lamp switch , ( speed control , brake shift interlock ) GEM module, RABS module (sometimes can smell wires getting hot when that one blows )
Fuse #22 under dash = air bag module, passenger airbag deactivation module
If I unhook computer it won't blow fuses under hood but as soon as I hook it back up it blows fuse #1 .
I removed computer and took it apart , no visual problems and no burnt smell .
Steps taken so far
Under hood
Checked all grounds and battery
unhooked all injectors
unhooked all COP's
unplugged mass air flow
Inside
Unplugged PATS module
Pulled instrument cluster
Removed radio
Unplugged BCM above fuse box
Pulled fuse box out and unplugged both wiring harnesses = not blowing fuse #18 under hood with computer hooked up .
Hooked plug back up same results
Hooked other back up and back to blowing fuse #18 under hood .
got late and stopped for the night .
Anyone have any Ideals ??
What next ??
I have several parts trucks to use any sensors , computer, fuse box etc. off of .
I'm aware that I have to use corresponding Key and tumbler, cluster, PATS and computer to make it run . ( Been there and done that numerous times during cab swaps and other issues )
Fuse # 18 under hood = powertrain control module, fuel injectors, fuel pump relay, mass air flow sensor
Fuse # 104 under hood = central junction box
Fuse #1 under dash = audio
Fuse # 3 under dash = cigar lighter, data link connector
Fuse # 15 under dash = stop lamp switch , ( speed control , brake shift interlock ) GEM module, RABS module (sometimes can smell wires getting hot when that one blows )
Fuse #22 under dash = air bag module, passenger airbag deactivation module
If I unhook computer it won't blow fuses under hood but as soon as I hook it back up it blows fuse #1 .
I removed computer and took it apart , no visual problems and no burnt smell .
Steps taken so far
Under hood
Checked all grounds and battery
unhooked all injectors
unhooked all COP's
unplugged mass air flow
Inside
Unplugged PATS module
Pulled instrument cluster
Removed radio
Unplugged BCM above fuse box
Pulled fuse box out and unplugged both wiring harnesses = not blowing fuse #18 under hood with computer hooked up .
Hooked plug back up same results
Hooked other back up and back to blowing fuse #18 under hood .
got late and stopped for the night .
Anyone have any Ideals ??
What next ??
I have several parts trucks to use any sensors , computer, fuse box etc. off of .
I'm aware that I have to use corresponding Key and tumbler, cluster, PATS and computer to make it run . ( Been there and done that numerous times during cab swaps and other issues )
Driving the wheels offer
Joined: Sep 2011
Posts: 1,056
Likes: 190
From: Maine USA
is this your truck or working on someone else's?
any recent work done?
get a test light and find out where there is current where there shouldn't be current - trace it back to a frayed insulator, improperly installed device, other surprises
any recent work done?
get a test light and find out where there is current where there shouldn't be current - trace it back to a frayed insulator, improperly installed device, other surprises
Thread Starter
Senior Member
Joined: Dec 2009
Posts: 963
Likes: 2
From: Lake Lafayette ,Mo
Working on for someone else. He had just bought it . Said it all started with cluster messing up and gauges sweeping .
I guess a wiring diagram would help so I know what goes to what .