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68 Thunderbird Headlights
THe 68 and 69 headlights run off vacuum routed thru the headlight switch. A leak anywhere in the switch. vacuum supply canisters, hoses, or the vacuum motors will cause slow operation. There is a manual override control under the hood near the vacuum suppply tanks, checking for vacuum there is a good start. Its a fairly complex system. prone to leaks due to the hoses getting old and brittle. Its was not uncommon to see the cars headlamp covers "winking at you even when the cars were om=nly a few years old. Also look for binding of the covers themselves, a shot of WD 40 on the pivot points my help. Good Luck!
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