Question about 2005 GMC Sierra 2500HD 4WD

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98 gmc 2500 intermittent starting 7.4l engine. started one day went to store now wont start, went under it seems the starter kinda clunks once and does nothing, its like the starter drive engauges but does not spin, now i checked for power on the main power post on starter its good, had a friend attempt to start the small wire does get power, battery voltage is 12.6v. i replaced the starter, now it did the same clunk with 2 cycles of ignition key, then it finally started, but its now intermittent, some times it will start some times just the clunk, so i went over all connections on starter and battery cables, the positive cable was in fairly bad shape, side mount battery :( i cleaned it the best i could. its almost like the starter gets the initial voltage but it cuts out or doesnt quite get enough. if i hold the key in start, the clunk then it just kinda stays but doesnt spin, gets fairly hot, didnt want to over heat it. unsure where to go next any help on this would be appreciated thanks.

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There are only two problems with electrical circuits. Too much amperage or too little amperage.We have to determine what you have.
An excellent test is to put your test meter red lead on the positive battery post and the black lead on the negative battery post. Crank the engine and record the voltage. Then place the red meter lead on the starter's battery terminal and the black lead on the negative battery post. Again crank the engine and record the voltage. The two voltages should be with in one half volt of each other. If the voltage difference is greater that one half volt, there is a resistance in the circuit, somewhere. I would expect the voltage to drop a volt or two, max
If the voltage dosent drop, there is high resistance resulting in low amperage. If the voltage drops too low then there is low resistance resulting in high amperage.
High resistance=dirty terminals
Low resistance = shorted wire, slow turning cranking motor maybe caused by bad starter, bad battery or hard to turn engine. ( engine bad, alternator or power steering pump bad, a/c pump bad, etc)
Can use head light for test. Turn on lights and note the brightness. Crank engine. If while cranking, the lights stay bright= high resistance.
If lights go dim = low resistance.

Posted on May 01, 2010

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Posted on Jan 02, 2017

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