Question 1...Check the highbeam Switch for proper operation. :thumbup:
Question 2...Float in the center of an egg? ..what YOKE are you referring to..?
You shouldn't give out your Email on an open forum..the members here all are good folk, but WE do get slimeball spammers and virus senders that TROLL the forums, although we try to prevent them, they do slip by..
Looks like we both hit "POST" at the same time...GMTA..
you hook the clip to a good ground and use the point to check the wire. When there is elecricity in the wire the tester will light up.
The main thing you use it for is to make sure electricity is getting where you want it when you want it there.
It would help if you could tell us what year and model of car you have.
Some of us are more familiar with some models than others.
The older cars are pretty easy to check and the new ones can be a real pain.
The main thing is to make sure that the fuse (s) is/are good. the connections are good, The bulbs themselves are good.
If they just quit it is usually something simple and easy to fix.
A YOLK is the center of an egg.
A YOKE is a power connecting device, most commonly on cars the ends of the driveshaft into which the u-joints fit, the transmission to driveshaft yoke, and the pinion shaft yoke on the differential. Some folks have been known to refer to the radiator mounting setup as a radiator yoke.
In the farm world it is seen across the necks of teams of oxen and around the necks of teams of horses.
If it is a later model Car, It may well have a Beam relay that has fallen out , or is defective , on the fuse panel..as well as if the light switch, if on the Steering column, or a stalk switch, could be bad or worn as it passes through the YOLK of the turnsignal switch and steering column.
Headlamp switch on most (or at least some ) have thermal overload reset breakers incorporated inside the switch, rarely are fuses at the buss used, and those that don't, usually hook to power by a Fuse link. There MAY be a fuse for a beam relay at the buss. (LTGHS) ..