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The only 30 amp under the hood is a fuse link that powers the RWAL (rear wheel anti-lock) relay so just remove the RWAL relay and try it. I hope this helps. Take Care.
The fuse is in the smart junction block? What is amp rating of fuse? My thought, for testing, use a new wire for proper wire color with inline fuse at sjb to rear lamp. I looked at wiring diagram, appears to be more than one fuse, don't know which one is blowing, the amp rating would help. I can only help with testing.
fuses blow because of dead shorts or excess current draw
to blow a 15 amp fuse indicates a dead short
by disconnecting the rear lights , the problem is in something else you have replaced
could be a problem in the head light wiring
you obviously have a short to ground on one of the wires to the back (if it was the front the brake shouldn't blow the fuse). the most common problem is usually in a trailer light harness. if you look under the drivers side rear of the truck, down under the tail light there will be a plugin junction. pull this plug-in apart and see if the fuse still blows. if it does then the problem is forward of that connector, if it doesn't then the problem is behind that plugin. be sure to check for "green death" (electrical corrosion) at all joints especially any trailer hook ups.
Same issue also when the fuse blows i looks my electric seat controls. I found the problem was underneath the hood underneath both the fuse boxes it was a power wire pinched under a plate that holds the fuse boxes on. This wire probably wore through after 140,000 miles of rubbing and being pinched. tell me if it works for you Vehicle: 2003 impala
a loose or damaged wire is causing a short circuit!
you ned to get it tested & rectified by a auto electrician ASAP!
as wiring gets very hot & can destroy your vehicle! {catch fire]
You have a serious short. The fuse is keeping you from frying the electrical system. Did you make any changes to the vehicle recently? Is it all stock electrical? If so, check the Ignition relay in the alternate fuse panel. If that does not work, post a reply and I'll help you dig further. Hope this helps
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