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Matt
Matt, Engineer
Category: Jeep
Satisfied Customers: 20583
Experience:  Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
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My name is ***** *****, my issue with my 1994 jeep is that

Customer Question

Customer: my name is ***** *****, my issue with my 1994 jeep is that it wont start crank or anything last night it was running fine but when i got into this morning it would not start battery level looked weak so i tried jumping it but no good when i turn the key all it does is click
JA: Thanks. Can you give me any more details about your issue?
Customer: when i put the key in the ignition everything turns on headlights/ dashlights sensor lights..then when i turn the key it will not start im uncertain if it is a starter issue or a battery issue
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Submitted: 11 months ago.
Category: Jeep
Expert:  Matt replied 11 months ago.

Hello

If the car's not cranking then first check it can turned over by hand so double checking for any mechanical issues

If OK then check that the main battery cables are on tight and the terminals are clean and bright. Do the same for the engine / gearbox earth strap.
Then follow the main positive lead back to the engine and down to the starter motor, and check the connection at this end as well.

There should also be a small wire to the motor which should have 12V when you're turning the ignition switch to crank. If the 12V isn't there, check back along this wire for damage to the insulation or corroded connections

This 12V feed comes directly from the ignition switch so this may be faulty and need replacing

Check the resistance of the main positive lead that runs down to the motor as anything more than a few ohms and it should be replaced

Don't forget to try a jump start from another car / battery as its possible the battery is poor, if you have a voltmeter a healthy battery should read 12.7+V

also try substituting the battery for another as I've known a very flat battery to drag down the system voltage too far even with jump cables

one other thing to consider is that the immobiliser is faulty and preventing the starter from being enabled - however if the dash / ignition lights are on then this usually means that its off

If this is all OK then its possible the car needs a new starter motor

Expert:  Matt replied 10 months ago.

Hi

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