When turning key on will not start all the time all gauges and radio work 2004 jeep wrangler

I would suspect the ignition switch (electrical) is the problem due to the age of your Jeep. Sometimes when you turn the ignition key if it's really bad, you will feel a bit of roughness indicating the switch is breaking apart inside.

Turn the key from off to on repeatedly and see if you notice if the fuel & volt gauges work each time.

If you find it's not the switch, you'll need to check your wiring ground locations to make sure they are not rusted and are making good electrical contact. Specifically, a ground wire to the dash panel.

If all grounds are in excellent condition then you may need to trace the wiring from the battery to the ign. switch to the gauges to see if you can find any damaged loose or pinched wiring. A good 12 volt test light should help you to isolate and find this issue, start at the battery and work your way through:)

FLEX your wiring a bit and make sure it's still flexible. Sometimes your wiring can become so corroded over time that current barely makes it to the destination.


Good luck.

stock car, no hacks?
fuses to cluster, there are 2 fuses.
the cluster has a simple self test mode, try that yet?
first?
2004 TJ,
the book is free

read chapter 8J for self test (IIRC push trip button key on)
if that fails 100% the fuses are blown.
the word is "Actuator test" in that chapter.

now the schematic, in chapter 8w, called wiring
page 40
fuse 26 PDC
and fuse 10 cab JB.

the cluster is really a computer.Display system)

when you jack the scan tool in, some power may leak form scan too to the display.

forget the scan tool, for now,

do the self test. first. if that fails, its lost power.


http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service


posted over 100 times, now.

is this a double post, i just posted a huge full answer
just a while ago, on gc.
for same pressure..
the pump check balls bad,or fuelpumpreg inside.
or the injectors leak
last poster too, said awhile, 1s, 1min, 1hr what is while>
spec. is 1/2 min leak down or longer.
so>? but keyon 4 times, is fail

unplug injectors, (elect) is pressure 49 +-5 psi? and holds.
now, bingo.
leak down fails now.
yes the filers are all in tank
yes, the injectors can leak

un connect fuel rail hose, to rail block it.
hold pressure now
yes, bad leaking injector
no,, pump assy bad. assembly, why takes bench tests.

A problem on the ignotion?
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2001 Jeep Wrangler

First, make sure you can turn the engine by hand. If you can't then the starter can't turn it either. Have someone else turn the key and look for the source of the click...may be a relay. Go over the starting circuit with a volt meter. Check for power at the starter main terminal and then with the key turned to "start" check for power at the trigger terminal on the starter. Check battery voltage and check relay operation.
You have a neutral safety switch on the transmission if its an automatic and a clutch switch if it's a stick. Check them as well. Make sure battery grounding on fender and block are also clean and secure.

check the wire near Diesel pump solnid, put a wire from +ve teminal of bettery check the solnid is working or not?

sounds like a bad ign switch to me

it must have a security key that means the switch key has a small chip in key

see i you have any codes may be a temp sensor if you dont have a code reader you can still get the codes by putting key in ignition turning it on but not starting it 3 times after the third time the engine light will blink a series of times like morse code. be perpared to jot down the number of blinks the ligh gives of there should be a slight paulse between codes, there also is usually a start and end code thsi may take a few time to get it ..once you have the numbers you can google the code and find the problem googleex (Jeep trouble code 55) you can use this trick on any chrysler car from 80 on up possibly earlier.