Question about 1993 Chevrolet S-10 Blazer
"Battery has juice" but maybe not enough.
It takes 125-200 amps to start the typical engine.
You need to have any kind of multimeter and have someone measure *on the posts* (not the clamps) to see if the voltage drops significantly while trying to start the engine.
If (for example) the voltage drops from (typically) 12.6 volts DC to ~ 10, then the starter should turn the engine over.
If it drops well below 10 volts, your battery is probably nearing the end of its service life.
(Checking the battery voltage without heavily loading it is useless; because of the change in the chemistry of lead-acid batteries, I have often seen a 12 volt battery apparently charge to as much as 19 volts and not be able to supply enough current to operate the headlights.)
If it drops only a few tenths of a volt, the battery clamps or the cable connected to the starter are not conducting enough to supply the needed current; you would need to remove and clean at least the battery clamps and terminals.
If this doesn't help, then it's time to get really dirty, remove the negative cable (you should be able to see if it is grounded to the block or chassis) and then remove and clean the heavy cable attached to the starter itself.
Don't service ANY electrical items without removing the ground cable from the battery or suffer a nasty surprise if you short a healthy battery.
Posted on May 21, 2008
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Posted on Jan 02, 2017
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