First i got two problems. One my cigar lighter in my 1992 jeep cherokee sport 4.0 high output doesn't work. i got three wires tied together behind it but only two are hooked up, should the third be hooked up. And second when i get my jeep up too 50-55 mph my jeep starts shaking all kinds of hell, i dont have a clue on that one.

No , can't be the relay , by looking at a wiring diagram the power outlet has different supply voltage . Fuse 1 25 amp is for power outlet an cigar lighter use's fuse # 2 25 amp. Free wiring diagrams here http://www.bbbind.com/free-tsb/ Enter vehicle info. year , make , model an engine size. Under system click on interior & driver amenity, then under subsystem click on cigar lighter . Click the search button , then the blue link. Looking at the diagram you will see they have different fuse's. Something up stream from there is blown . Need to look at electrical distribution diagrams. Go back to system an click on electrical distribution then under subsystem click on power distribution . Click the search button then the blue link. Scroll down to the # 6 diagram . You will see fuse # 4 50 amp location is under hood fuse box . Check that fuse .

My info shows a separate power outlet, will that work for your charger?

At the cigar lighter, red wire is voltage and black wire is ground. You have to have both or it won't work.

the first grand cherokee laredo was in 1992 . it was all jeep sports back then, the blocks are all the same .you will need to use some of the sensors from the old motor, the distributor and oil sending unit and temp sensor. will be no problem. if I can put a ford ranger motor in a mercury sable your swap is easier

replace cigar lighter assembly,

1992 Jeep Cherokee Sport drivers side rear qtr panel, for complete set, basically it costs Approx $370 to $450.------- Click this link below to order the parts:--- http://www.automotix.net/usedautoparts/1992-jeep-cherokee-quarter_panel-inventory.html ---------- This will help.Thanks.Helpmech.

Possibile bad ground. Get a jumper wire and attach it to a good clean piece of metal and see if it helps. Bad bulb sockets are common also, but I can't see 4 sockets going bad at the same time. there should be a common colored wire coming from all the bulb sockets in a given tailight. This will be the ground. Skin some insulation off this wire and ground it and see if your problem doesn't go away.

the fuse will be 1 of 3 auxpwr cig radio
if your radio is not working also try the radio fuse, some older vehicle have the cigar lighter tied into the radio fusable link

1. your radio and clock are not wired at the right place in the fuse box. connect to fuse where power is present when the key is turned off
2. for your heating, check fuses first than relays

the cigar lighter copmartment itself might b faulty so fix that

You should be able to get one on cd on the internet I got ones for vitaras montereys troopers and terranos so worth a try.