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After cleaning, wire-brushing, whatever, to the battery cables, it's best to coat them with some kind of grease to prevent oxidation.
There is a special dielectric grease sold to prevent corrosion in connectors (works great for headlight plugs especially) but other greases will work, like the silicone brake grease (Syl-Glide). Put something one there to prevent reoccurence of corrosion.
It's possible the battery is being overcharged and is making a mess while the car's running. This can be due to a shorted cell in the battery getting real hot, or an alternator that's overcharging. The small red wire from the alternator needs to be inspected- if it grounds out, it can turn the alternator on trying to make it charge 100%, and that'll burn out light bulbs and boil the battery dry. The wire can be inspected around the (filthy!) bottom crank pulley if you remove the splash pan below the engine- it might be gone anyway.
Did you check the wires around the relay? Take it off the fender and flip it over to inspect? I had, of all things, a broken bracket that held the coil and PS reservoir... the edge of that severed a wire for the high beams. If the light relay clicks on and off when you pull the stalk, the control wire is working, and either the bulbs are burnt out (not likely) or the relay is defective, or wiring to it has broken. Note that there's a second headlight relay by your left foot on the firewall- but if it goes out the entire headlight circuit won't work (parking lights will).
Good luck again!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 229K, 88 744GLE- 218K, 82 245T-181K Also responsible for the care and feeding of: 88 745GLE, 231K, 87 244DL, 239K, 88 245DL, 246K
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