The rear lights on my 1982 gmc k1500 stepside only work when in reverse otherwise they stay unlit. no light up when brakes are hit or night time lights when all other lights work, but if i put in reverse they work fine. what causes this?
Reverse lights are on a different circuit to the brake/tail/clearance lights. Check fuses for the others.
on older nissans dashoard and tail light is on same fuse. can you please check fuses on drivers side under your steering wheel? check #16. 
SOURCE: Brake lights do not work
This is a well documented problem, replace the turn signal/multifunction switch to correct this issue, this very problem happened on my GMC, it is a 99 as well, replaced the switch as instructed by a chevy forum member and it fixed the problem
SOURCE: Brake & ABS Warning LIght
There is a known failure of the ABS system control board which typically causes this problem. THere are companies out there that will rebuild your current board (if it's rebuildable). Do a search on ABS repair in Moscow, Iowa.
They will rebuild the module for $150.00 and warrant the repair for 5 years (as opposed to up to a $1000 form GM, and no guarantee as to how ling it will last.).
I did this to my '01 Tahoe and am real happy with it. The company offers diagnosis tests to help you determine if the problem is your ABS module.
Reply back what you find.
SOURCE: 1982 ford stepside. no brake lights. tried putting
Check the brake switch on the back of the brake pedal up behind the dash it should have to wires going to it and will be about 2 1/2 inchs long and threaded. one end will hit the brake pedal on the back side it will look like this >L where the arrow points you will see the switch it will have a quick disconnect on the back of it, and if you take a paper clip and install on the back side intot he wire harness quick disconnet swith look to see if the brake lights are on. If they are on then the switch is bad. to replace it has a half inch lock nut you can back off 1/4 turn then unscrew it out any parts store will carry it. It lists for 14.95 it could be the turn signal switch too. Now this is assuming you checked the fuses also this has two buttons on it and it may be the plug is loose. here is the web page the brake switch is at the bottom and the turn signal switch is about midway. This has a picture with it and price as well. Thanks for using fix-ya http://www.jcwhitney.com/switches/c1643j1s17.jcwx
SOURCE: I have 2002 GMC van
This sounds like a bad ground, remove the brake light sockets and remove the bulbs, take a look at the sockets and see if the socket is burt or melting, the most common problem is the socket goes bad and cant handle the brake and park lights at the same time , this is cause by a bad ground inside the socket, try cleaning the contacts in the socket and gentle prying them out to make a better contact to the bulb, also make sure there are no burnt marks on the contact terminals on the bulbs, good day
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