Quick mechanic question...

Discussion in 'The Pub' started by billyg121, Mar 8, 2015.

  1. billyg121

    billyg121 Supporting Member

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    I have an old honda civic. It has been struggling to turn over and start. Bought a new battery. Still struggling to start. It does turn over a few times and then quits. Heee is the thing, i can jump it and get it started. WTF! Sounds like something electrical...but why when jumping a good battery, can i get it started? Thanks to all the manly TGPer mechanincs out there.
     
  2. Woodenfish

    Woodenfish Member

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    It sounds like high resistance in the battery cable. Are any of them getting extremely hot? Careful, don't burn yourself.
     
  3. Scott L

    Scott L Gold Supporting Member

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    How clean are the battery cable connectors? Are they loose?
     
  4. billyg121

    billyg121 Supporting Member

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    No ive checked the connections, they all seem good. Havent noticed any heat.
     
  5. crambone

    crambone Supporting Member

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  6. Peteyvee

    Peteyvee Premium Platinum Member

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    Put a VOM on the battery cables and measure the resistance...
     
  7. Scott L

    Scott L Gold Supporting Member

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    How new is the battery - if your alternator is on the way out, your new battery may already be low.
     
  8. billyg121

    billyg121 Supporting Member

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    Battery is just 2 months old. Had it tested today and it was 100%. BTW, thanks for helping me through this guys.
     
  9. Dr. Tweedbucket

    Dr. Tweedbucket Deluxe model available !!!11

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    Assuming your battery, cables and grounding is good, your starter could be dragging.... bushings worn out which will cause it to draw a lot of current. The jump supplies enough current to turn it over fast enough to start.

    :dunno
     
  10. Boobala

    Boobala Member

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    I'm betting on a bad Starter. Put an Amp meter on the starter cable, and if its drawing a lot more than 300 amps (say 400) , it's a bad Starter.
     
  11. danny60

    danny60 Member

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    Take the cables off the battery and clean them using a battery terminal cleaning brush.
     
  12. Scott L

    Scott L Gold Supporting Member

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    A paste with Baking Soda and water will help with any corrosive build up. Or hit Autozone for terminal cleaner.
     
  13. Jonny Hotnuts

    Jonny Hotnuts Member

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  14. ldizzle

    ldizzle Supporting Member

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    ^ solenoid was my first thought as well. Depending on the model/yr civic, they're usually sold together built into the starter. Take it to autozone/your favorite auto part supplier and ask them to test it. Should be extremely easy to take on and off(like two bolts).
     
  15. billyg121

    billyg121 Supporting Member

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    Cool! Thanks guys. Im going to take it to auto zone tomorrow.
     
  16. zerorez

    zerorez Supporting Member

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    If the starter checks out, then look at ignition path, plugs, wires, distributor, rotor.
     
  17. Woodenfish

    Woodenfish Member

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    Resistance is best tested with a voltmeter measuring voltage drop across two points in a circuit. An ohmmeter measures static resistance but a voltage drop test measures dynamic. A max 0.2v drop over battery ground terminal to ground cable end bolt on engine and 0.2v drop over battery positive cable to starter motor is specified. A max 0.5v drop from battery positive terminal to starter solenoid terminal will complete the proper voltage drop checks through the ignition switch. Measuring the battery voltage while engine cranking can help diagnose. Engine cranking voltage has to be 9.6v or higher. Jumping a vehicles battery adds new circuits which may be why the car starts easier.
     
  18. cygnusx1

    cygnusx1 Member

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    Grounds and power connections.
     

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