re: Center Headlights on Alfettas

[TJCallahan@domain.elided]

Stefano,

The center headlights are the high beams. (You're talking about a four-light 
setup on an Alfetta GT, yes?)

All lights are 5.75in in diameter.

The two outside lights are hi-lo combinations.

The two inside lights are hi only lights.

When you turn on your dipped beams (or city lights or low beams), only the 
two outside lights are on. They spray light forward and down, out of the eyes 
of on coming drivers.

When you turn on the high beams, all four lights are on. The outside two are 
using a second, different, filament from when the "low" beams were on. The 
two centers have a single filament that turns on only for the high beams. 
They spray light forward and parallel to the ground (more or less).

If you don't have all four on when you move your stalk to the "High" 
position, you have a wiring or bulb problem. Do you have standard USA sealed 
beam lamps? If yes, hit them hard with the nearest heavy object and replace 
them with E-code halogen lamps. 

The outside lamps will take an H4 bulb each, the inside high beam lamps will 
take an H1 each. Use quality lamps and bulbs (see discussion of this topic in 
recent digests).

As for troubleshooting, some basic tips are to measure for voltage at the 
lamp connections when the lights are on. If you have voltage, it's probably a 
burned out lamp. 

If you don't have voltage - check and clean grounds, jump known volts across 
the lamp connections to test the bulb, check your switch.

There's probably a bunch of other stuff you should check, I'll leave that to 
the more experienced digesti to describe.

Tom
Seattle
10123
11615 (with all four lamps working, finally)

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