Question about 1998 GMC Jimmy

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1999 GMC Jimmy cranks fine when i first crank it in the morning. After i make one stop SECURITY light flashes and it wont start. After i let it sit for a while it cranks with no problem but the battery light stays on.

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  • wardracquel Oct 08, 2010

    this person is not clear on what he is saying can i get another opinion please

  • wardracquel Oct 08, 2010

    yes

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  • Master
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It's clear that the battery voltage is the root cause of your problem: SECURITY light flashing and engine does not start. Test the car battery & the alternator supply voltage. If the alternator voltage is around 14 Volts, engine idling and headlamps low beam turned ON, then the battery is bad. After engine stopping, the battery voltage should be at least 12,4 Volts. The battery could be too old and needs to be replaced. If the alternator voltage is below 13,8 Volts then you must check up first time the alternator belt & tensioner pulley. If everything is OK, then the alternator is out of order and needs to be repaired in a dedicated workshop: weared brushes, bad voltage regulator, ...

Posted on Oct 08, 2010

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  • GMC Master
  • 11,800 Answers

First of all you should check the voltage at the battery when the warning light is on - if it's below 14.2 volts clean them inside out with wire wool. If it's the same then try another battery; if even then it's the same then the alternator is failing and it must be replaced.
The security light flashes when the voltage at the battery is too low or the security contact in the key hub is faulty. The only way to fix that reliably is to replace the hub and the keys.

Posted on Oct 08, 2010

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