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Old 02-18-2014, 07:25 PM   #1
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No Power - Wont Start

Went to start my jeep the other night, heard a weird click/poof sound then nothing else. When I try to crank it I get no power at all, no lights, no clicks from the starter. I haven't had time to get under the hood yet. What should I check?

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Old 02-18-2014, 07:32 PM   #2
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Test the battery for voltage... Then battery ground. Even if there is a little juice in the battery the dash should light up dimly

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Old 02-18-2014, 07:55 PM   #3
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I will check the battery in the morning. Assuming it tests fine, could my alternator be bad?
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Old 02-18-2014, 09:08 PM   #4
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I will check the battery in the morning. Assuming it tests fine, could my alternator be bad?
The alternator charges your battery and powers accessories while running. If the battery holds a charge a bad alternator wouldn't cause the dash to not light up
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Old 02-18-2014, 10:58 PM   #5
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If the battery is good bypass the clutch safety switch behind the glove box. If it's not that it's prob the ignition switch.
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Old 02-18-2014, 11:16 PM   #6
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The alternator charges your battery and powers accessories while running. If the battery holds a charge a bad alternator wouldn't cause the dash to not light up
X2 old school (new school guys say this is bad for some reason like the battery is a capacitor and you'll fry stuff, (I do it all the time) so I never seen it break stuff or proof it can. But figured I'd throw out the warning and let you decide. If you have a volt meter jump the jeep. While running it should be in the 14 s at the battery if the alternator is good. Or you can disconnect a battery cable while running and it should continue to do so. If it dies your alternator is bad since It can run of it alone. The newest vehicle I did this on was a 2009 ram. Proved good alt and bad battery. Tons of electronics never messed up anything. Up to you. If someone posts not to do it that actually had harm I'll be shocked.
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Old 02-19-2014, 10:44 AM   #7
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Old school way to test alt is to see if keeps running with battery disconnected but have seen it go real bad and I never do it anymore

What I say happen was on a late 80s suburban guy started it and disconnected batter cable and it continued to run fine but when he reconnected the battery cable (still running) he got a voltage spike that fried main computer and engine stopped and did not run again until ECU replaced

You pays your money and takes your chances but not worth the gamble for me

As for his prob he need to put tranny in park or neutral and run a small jumper from battery positive to small terminal on starter(solenoid) and see if it cranks

If it does prob is in start circuit ie key switch park neurtal switch clutch switch relay ect

If it don't prob is battery or pos or neg cables or their connections or starter

If even headlights don't work probably run down battery or bad cable or connection esp ground from battery to body

Bad alt is one of many reasons battery might be discharged
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Old 02-19-2014, 11:03 AM   #8
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First, put a meter on the battery and see if it's 12V plus. If it is, then pull the terminals off the battery and clean them. Do not just look at them and say they seem ok, pull and clean.

Will it start if jumped? After it's running you should see about 14V at the battery. If not pull it and have it tested.

If no start, then pull and clean connection to starter and the chassis ground connection.

Side note, these will not run without a battery connected. The alternator gets it's field supply from the battery, they are not self exciting. Without the batttery the alternator does not produce any output.

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