wiring/fuse problem

koaks271

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Banned
Joined
Jul 11, 2006
Location
Cary
I have an 85 K-5 blazer with a throttle body 350. I wasn't the one who switched it over to throttle body though. When i bought the truck it ran fine, but after doing mods to where it is now, it keeps blowing a fuse. Its the ecmb fuse(?) and i checked and made sure it was the right fuse and it is. For awhile it started blowing the fuse while i was driving cutting the motor. Now its sitting at my house unable to start because everytime i try to turn it over it blows that same fuse. I am not very good with wiring stuff, is there anyone near the Cary/Raleigh area that could help me out? or if anyone on here has and suggestions. My only plan of action was to go through the wiring looking for a loose wire or one thats maybe grounded out. I really don't have any idea though. So just let me know if you have any ideas.

Thanks,
Kevin
 
Ok,
Assuming there is no dead short in the b+ supply wire, its possible the fuse is undersized. Remember, it ran OK for awhile then the fuse failed. Reminds me of a 15A fuse trying to do the job of a 20A fuse. I would pull the positive battery connection and measure the resistance of the ecmb lead. Divide that value into 12v and that will give you the fuse amperage you need. If its a value over 30A, I would look for a dead short in the wire routing....12V/0.4ohms=30A, etc..
:beer:
 
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