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Did you replace the relay with a new one, or a used one. The old one can usually be resurrected by taking the relay out of the housing, using a pencil soldering iron, reflow the solder on the circuit board (pay special attention to the icy looking solder spots) and then using a small piece of 600 grit sandpaper clean all 4 contact points, and clean again with electrical contact cleaner. Finally burnish the contacts with a folded dollar bill (a c-note works too). The Hella relays have good parts, but are probably assembled by young ladies who don't have a clue.
If you stuck in a new one, check the fuse stack and roll all the fuses. If this fixes the problem, then you need to clean all the fuse holders and coat with dialectric grease, and clean or replace the fuses.
If the problem persists, look under the car for the harness to the solenoid. Check for bare areas on the wires, and repair as necessary. Also check the wiring connection at the push button switch, and follow the wiring harness from the button to the solenoid. Radio changes could have pinched a wire there too.
Last resort, the solenoid will need to come out, and you will need to clean the passages and either replace the solenoid or try cleaning it. You will need a new O-ring kit (IPD or FCP) and some fairly flexible fingers.
Does your relay make a whining noise when the light comes on, or does the light come on full bright? If the light is dim and you can hear the whine, then you probably have a relay/wire problem. If it is on full bright, then you probably have a solenoid problem.
One other thing to check, is the alternator output at the battery. Clean the Battery connectors. A corroded connection there can make all kinds of wierd electrical problems happen.
Bill
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