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I have a 2004 cadillac cts and bought a new battery and will not start . I tried to jump start it from the relay switch and it wont start. Is it the starter?

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Do you own a voltmeter ? Do you know how to use one ?
Starter Voltage Drop Could be the battery cable's Do you know what voltage drop is ? Which pin's did you try to do your jump start from ? 30 & 87 ? Where the relay plugs into right ? Is there B+ voltage at the starter fuse 30 amp .

Posted on May 06, 2017


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Posted on Jan 02, 2017


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2004 cadillac cts wont start only with relay jump start

What relay ? Starter relay ? Check engine light on ? Do you know how to test power and control circuit at the relay base ? where the relay plugs into ? The PCM - engine computer is suppose to energize that relay , IF it see's a input from the transmission range sensor switch (park or neutral ) or if there are no anti-theft system problems . Pull the relay and look at the bottom (where pins are ) you will see four sets of numbers . 30 & 87 and 85 & 86 .30 should have B+ voltage 87 goes down to the starter solenoid . If you used a piece of wire an jumped those two the starter should crank .(if it's good ) Pin's 86 & 85 - one should have B+ voltage and the other the ECM supply's a ground . free wiring diagrams . Enter vehicle info. year , make , model and engine size . Under system click on engine then under subsystem click starting . View the starter electrical system diagram .
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