Ground wires

Question about grounding wires.
I have an 82 Scrambler .
I am not very good with electrical stuff and I am having problems with lights and dash lights.
I have read forums and tried to educate myself and everyone talks about checking the grounds.
THE DUMB QUESTION IS – When these jeeps were built was there a particular place – places where the ground wire/were attached?
I have read on Forums about the wiring harness looking like a rats nest and a nightmare, my wiring under my dash look very good, as far as I can tell.
Every wire has its place I have two loose wires, one with a flat end conector and the other with a round end conector, I have no idea where they go, but over all my wiring looks clean.
Any help would be very much appreciated.
Thanks,
Wayne.

Hi Wayne,first what kind of problems do you have with your lights?second on ground wires over time corossion and rust form between all the body pannels [grill to fenders,dash to body, fenders to body so on and so on] plus at some time someone may have left off a factory grounding strap when they worked on the jeep,I had a small fire under the hood of mine a while back and had to get into the wireing anyway so while I was at it I ran all new grounds to every thing ,new ground from the battery to engine block then to frame ,then i put a brass bolt thru the pass side fender well and ran a ground from the battery to it and new ground wires from every thing electrical back to that,I grounded the alt,starter, dash ,grill,left fender ,head light buckets all running lights on the front and the tail lights,etc,etc,it tokk all day but after it was done I now have no dim lights or have to bump or jiggle any thing to get it to work ,I still need to pull the dash back and replace a few bulbs there and clean the sockets where they plug into but over all it was well worth the time spent and now it should be good to go for another 25 years or so.

P.S I also used waterproof ring terminals on everything ,the kind that you heat with the shrink wrap on the ends.

Thanks for the reply:
I was having probs with my signals but they are working now.
Last night I went in the garage it was dark and I noticed that the dash lights for the violt gauge was lit up.
I turned the light (dimmer) switch to see if it would go out but it did not, I took the buld out so I did not end up with a flat batt.
When I turn the light switch to light up the dash none of ther lights come on.
The funny thing was I was under the dash a couple of days ago and moved a handful of wires at the same time and the dash lit up like a Christmas tree, I was just trying to find a ground to see if it needed cleaning?
The light switch is new.
Changing the whole wiring harness like you did is well beyond me..

wayne I never changed the harness,just ran new ground's to everythingand cleaned up all connections.not very difficult at all.