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Dear ibs740,
Hope you're well. The best way to water-proof under-car connections is butyl rubber tape. Butyl rubber is a very sticky material. You should be able to get some at a place that does auto glass, or one that does airconditioning installs.
Once you've repaired the connection, clean the wires with alcohol (to remove grease, etc.). Start two inches (50mm) from the connection, and wrap the butyl tape such that one turn overlaps the prior turn. Continue 'til you're two inches (50mm) past the connection.
Next, take a sheet of plastic (any will do) and drape it over the butyl. Grip the plastic-draped butyl and compress it, gently rolling it in your hand. This will form the butyl into a single piece of material. Remove the plastic and toss it. Butyl rubber never really hardens, so this should make a lasting waterproof seal.
As to the bulb sensor, mis-matched bulbs - or matched bulbs that have some corrosion on the bulb contacts (or the bulb-holder contacts) - can cause unequal current draws, which "upsets" the relay and causes the warning light to come on.
Hope this helps.
Yours faithfully,
Spook
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