I just got a call from my daughter.

Car started fine this morning, after driving less the 1/4 mile car stumbles dash board lights up with battery light blinking ( she says). The car stalls. She tries to start it again and nothing but the click of te relay.

The stumbling and the click of the relay sounds like a very low voltage issue, but wouldn't the Alternator hold the voltage up once the car is running even if the battery was dying.

Oil change was two weeks ago so the motor has oil. Serpentine belt has less then 2000 miles on it so I'm assuming that didn't break. Any thoughts? I haven't gotten to teh car yet to even check voltages and connections. Just running through scenarios in my mind.
Last weekend I did the Quad Beam Mod.. It was done correctly and cleanly so I'm ruling that out unless for soem reason grounding that yellow wire drains the heck out of the battery.

 

Sounds like the alternator died. But if you just did some electrical work, I would definitely check that too. Blazers are known for having problems with grounding spots. Always good to check and double-check.

If the serpentine belt broke, you should be able to see that very quickly. If it did, then that's the culprit, because it drives the alternator.

Changing the oil has nothing to do with the problem you mentioned.

 

I mentioned the Oil Change Because a dry Sump would cause a siezed engine.

That would prevent the starter from turning teh motor and the stumbling as things tightened up.

 

I'm gonna say the alternator died also. The truck would stay running from the battery power till it gets used up, then what you described would occur.

 

Thanks I guess what I see as strange is that teh battery had enough current to crank the engine over but then in such a short distance, teh voltage drops so fast that it couldn't support the 'Injectors'.
Of course it was beautiful yesterday and today it's raining.

 

So if it is raining there, I can only assume the wipers & headlights were on.
That will drain the battery pretty fast, especially if it is older.

 

Good point. Very good point.

 

 

It was the Alternator.
My wife beat me to my daughters Blazer and I told her to jump the battery and not to start it but just let it fully charge.

I got to her about 6:00pm. Started the Blazer with 13.5 volts at the Battery and as soon as it started Voltage dropped to 12.00 The alternator was dragging it down. Turned off the car, Battery Voltage Climbed up a bit.
Sent them out for an Alternator while I pulled this one and cleaned the terminals. Finally something on this Engine that is easy to get to. Glad I brought teh flashlight .. the sun wasn't waiting for me.

Thanks.

 

Glad to hear you got her going again!