Stock ford radio AM/FM/Cass/CD. CD & Cass work, AM/FM does not. i was going to start by checking the antenna cable, checking all connections. any other suggestions?

FM need a good antenna, buT FM in the country side will be weak
or even dead, FM does not travel far at all ,even only 20 miles
AM we have super power stations that cover most the country.
I bet the RADIO is just fine.
it can be bench tested with a 1 strand of say 4 feet of wire for an antenna.
you posted about only a RADIO not CD and not AM
FM is short ranged, 88 to 108MHz. is that
no town told , but you can call your closest station and ask them there coverage, spec.? 50miles or 10 or? what ever.
or you can go to a 2nd car, test FM see if there is one strong station.
if not there there is none.
on home RADIO we use a roof mounted 30Ft high antenna, FM
and goes way father,.
in car that can not be done, most antenna amps in cars only increase noise.
is this your first car, or first ever FM radio.?
yes antenna's can fail even the ground, (it is 2 wire coax to fail)
the mount can corrode. the cable can be bad.
some have antenna in the wind shield glass, and some one puts in new glass with no antenna there well that fails hard.
FM is mostly a CITY BIG DEAL, no living in the sticks.
also there are tiny FM micro station,and those are weak.
only line get a FM map for you town, just like Cell phones but for FM.
radio. see what is there and its POWER/coverage.

If you radio is the push in type knob to turn it on with volume control that switch has failed and can be replaced you can obtain it from a car radio eectronics store or go to a junk yard and get another radio or switch out of a donor vehicle the dealer may have it but the the trucks over 24-25 years old and maybe discontinued ford parts giant has most discontinued parts and is a possibility either way a brand new switch is better than a used one /// LORAN AUTO RADIO & SECURITY 3762 BOSTON ROAD BRONX NEW YORK 10469 (718)547-1500 ////THIS PLACE HAD MINE IN STOCK TWICE (1) WAS FOR A REGULAR AM/FM 2005 FORD CROWN VICTORIA RADIO NO TAPE/CD (2) WAS FOR A 1987 E350 AM/FM W/TAPE DECK AND OH YEAH! (3) I ALMOST FORGOT 2000 LINCOLN TOWN CAR AM/FM W/TAPE AND CD IN THE TRUNK SO ALL WERE BETWEEN $15.00-20.00 AND IN STOCK YOU MAYBE ABLE TO CALL THEM BUT I RECOMMEND YOU GET THE PART #OFF THE SWITCH BEFORE HAND SO THEY CAN BE 100% SURE OR SEND A PICTURE TO THERE EMAIL AFTER CALLING I REMEMBER THAT THE TECH JUST LOOKED UP THE RADIO WITHOUT THE # BUT NOW THIS MIGHT BE A GOOD IDEA MY LAST TIME WAS 10 YEARS AGO AND ALL SWITCHES ARE STILL WORKING BUT DIFFERENT COMPANIES MAY HAVE ALTERNATE PART #'S GOOD LUCK STEPHEN ///OTHER POSSIBLE PHONE NUMBERS (718)547-1577 THIS IS MY PLACE FOR MOST AUTO RADIO REPAIR PARTS HIGH QUALITY AND ALWAYS IN STOCK SO FAR! BUT DON'T WORRY THEY CAN ABSOLUTELY GET IT AND POSSIBLE DROP SHIP FROM SUPPLIER OK

no problem told at all, radio or CD dead.
or doing radio upgrades, must be guess the JOB>?
there are many radios used, sold with car,day 1new.
and wiring is not the same
the lower right corner of the real jeep radio as like 3 digit code
like REC or lots of others
not posting real radio model codes gets you no answers
you meant grand cherokee sure.
the service manual on line covers this. pay $20 and read it.
no country told, my answers are USA only and OEM spec stock cars only.
got the CD changer version? now?
got the huge amp model version
some have antenna amp versions.
got steering radio controls , those will be dead if new none jeep radio is used
the schematic is 14 + long pages, I refuse to paste here, Hard.

see them here
https://www.eautorepair.net/marketingpages/404.html

with this radio

1999-2000 Jeep Grand Cherokee AM FM CD Cass Radio Receiver P04858540AG OEM the pin out for this radio is clearly shown on top of chassis, sticker.

just one of many , new. 2000 jeep
'learn to pull the radio out and photo the radio sticker and then ask how
it wires up, it also uses serial comms from PCM on some model versions
yes complex.

Depends on what audio system you have . Base , upscale etc.... You need to look on the RPO code sticker , could be in the glove box , center console , trunk , driver door jam ? RPO - regular production order .

UL0
Radio AM/FM Stereo, Seek/Scan, Auto REV Music Search Cass, Auto Tone, Clock, ETR
UM7
Radio AM/FM Stereo, Seek/Scan, Clock, ETR
UN0
Radio AM/FM Stereo, Seek/Scan, Compact Disc, Auto Tone, Clock, ETR
UN6
Radio AM/FM Stereo, Seek/Scan, Auto Rev Music Search Cass, Clock, ETR
UP0
Radio AM/FM Stereo, Seek/Scan, Auto Rev Music Search Cass, CD, Auto Tone, Clock, ETR

Troubleshooting the problem may depend on which of several radio options is installed in your vehicle. However, the most probable cause is the antenna. Two different antennas are involved here - one for XM (satellite), one for FM (terrestrial - window type). To start, I would check the FM antenna connections at the window and the radio and the cable between them. If that isn't the problem, the radio is probably faulty.

Try checking the wire connection of the antenna to the back of the radio. Outside the car, make sure the antenna is tightly attached to the base .

FM requires a good antenna connection. Check the connection at both ends, and check for any damage to the antenna cable. If you have the rear mounted power antenna, the cable runs forward under the carpet to the dash.

If the antenna is good, then the FM section of the radio has failed.

check antenna cable connections at radio & antenna.suspect power antenna if equipped.

fm needs a much shorter aerial to work than am.if the antenna is broken or missing,the am can go out.barring that,the radio is no good .the trim panel on the front pops off and there is 4 bolts holding in the radio.there are 3 plugs on back and the antenna cable.check that it is plugged in.

FM radio reception relies on a very good working antenna and cable, AM reception much less so. Unfortunately, the problem could be in the radio itself as there are separate signal processors in it for FM and AM. However, the most common problem is a bad cable connection at the antenna or the radio, or a bad cable itself (corroded, pinched, broken wire inside).
.
A couple of simple things to check: if the antenna is in the window, it may have become disconnected from the cable at the window. If the antenna is body mounted, could be a bad cable connection at the base of the antenna, and in this case, the base of the antenna could be very corroded.

You could also check the antenna cable from end to end using a continuity checker. If you can't figure that out, you could just try replacing the cable (or body mounted antenna in that case).