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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 03-30-2015, 02:37 AM   #11 (permalink)
Steve83
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Did you clean the alternator mounting points?



Did you peel & clean the battery terminals?



To find a voltage drop, set your digital multimeter (DMM) to the 20VDC range (disable AUTO range), and probe from one battery's (+) terminal to the other. Try to get the meter probe on the actual BATTERY terminal; not the CABLE terminal, or the bolt (unless you're 100% certain they're totally clean & making perfect contact). It should read less than 0.5VDC (or whatever your meter shows when the probes are touching each other). If it's significantly higher, begin moving ONE probe at a time across ONE electrical connection at a time - for instance: from the battery terminal to the cable terminal; or from the cable terminal to the cable itself (by piercing the insulation with the probe). When you see the voltage reading change, you just moved across a point of high resistance. Pinpoint it by moving the probes closer together, then disassemble, clean, & tighten that joint. Applying ELECTRICAL grease (not DIelectric, thermal, or chassis) will keep the connection clean much longer. Then, START OVER FROM THE BEGINNING.

Once you've done the (+) cables, start over on the (-) terminals, and find/fix any resistance in that circuit. When you're done, the batteries should always show the exact same voltage.

The same technique works along any other electrical conductor (wire/cable/ground) between 2 points.

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Old 03-30-2015, 12:56 PM   #12 (permalink)
Daz
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I didnt clean the alternator mounting poles..I refuse to clean the alternator mounting poles..

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Old 03-31-2015, 12:40 AM   #13 (permalink)
Steve83
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Well, you GO, girl!
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SOLD '97 Silverado K3500 Xcab longbed dually 10KGVWR 212Kmi
Dual Alternator Mod, Dorman FSD in grille, FFM raised, Opti-Lube, high idle switch, Curt Cl.V receiver, reverse sensors, hitching lights, 750W inverter, in-dash USB power, mini bed crane, all-on brights, Magnefines, revised 4WD actuator
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