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When the bulbs, connectors, system voltage, lenses, and reflectors are in good condition, 914 taillights and back-up lights work well. A few suggestions:
1. Check the condition of your battery and alternator. Dim lights are an early warning sign of a problem here.
2. Check the condition of your headlight switch. Many of these switches are in poor conditon and have significant resistance. If the switch feels hot (reach up under the dash), it may be ready to go.
3. Check your fusebox contacts and fuses for corrosion. I've seen some that were so bad it was a miracle anything worked at all.
4. Check the conditions of the grounds for the lights. Many are totally corroded, loose, green corrosion gook on the wires, etc.
5. Use a contact cleaner like Deoxit to clean all of the bulb sockets and bulb contacts. Usually this is a white flaky corrosion.
6. Check your bulb ratings and make sure they're the right bulbs.
7. The chrome plating on the tail light reflectors is often corroded or completely gone. A cheap fix that works well is to respray with "chrome paint". I did this years ago on one of my reflectors and it is very difficult to tell from looking at the lights when on, which one has the paint and which one has the chrome finish.
8. Lenses - often incredibly dirty inside, due to the leaky seal. Clean them, and replace the edge seal with 1/8" foam "rope" you can get from Home Depot.
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