I am getting ready to bring in 2nd car for service.
It requires a jump to start, starts right up and I can drive.
But as soon as I park, it's done until another jump.
I assume that means dead batt, but the charging circuit is prolly OK, or not necessarily?

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Sounds like a dead battery to me. Have you checked the terminals, to make sure something isn't just loose? I had that situation once.

Most car places will check it. The Walmart car departments are closed around here.

Quote
Acer
Sounds like a dead battery to me. Have you checked the terminals, to make sure something isn't just loose? I had that situation once.

Right. Could be it's dead dead, or it's not connected.

Even a new battery with a poor connection might not work too well.

At first blush, it would seem the charging system is fine but the battery just won't hold a charge.

Put a DMM across the battery terminals to measure the voltage at idle and then raise the RPM to about 1500-2000.

The voltage should rise from about 13VDC to ~14.5

Or turn on the headlights at idle.

Look at the beams on a wall, if possible.

Rev the engine to about 2000RPM.

You should see the beams brighten.

If they do, the alternator/charging system is probably ok.

Wherever your taking it for service should confirm what you've found.

AMZ has voltmeters that plug into the cigarette lighter socket to give you an indication of the condition of your battery and charging circuit.

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terminals are tight, and pretty sure it's an older batt.

I've got a DVM, but can't be in both places at the same time to measure and rev.

I'll try the headlight though.

Gratzie all.

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How long are you driving it for after you jump it? It should be at least a half hour. But, as mentioned, a batter test is in order.

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Many auto parts stores will do battery testing and charging for free.

I can remember when you could jump start a car, disconnect or even remove the battery entirely and the car would just run until the next stall. The stall wasn't due to lack of battery, it was due to it being a junker, the only kind of car I knew until I bought that brand new '65 Chevy Impala.

A roomy handsome looking car, coated in metallic blue it served my single minded 18 year-old self admirably as date bait but was a 'Monday Car'. It lived up to that description in every sense of the term and was dead and buried before it hit 20K.

......most don't allow charging............car purchases..........

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If the charging system is bad, you won’t be able to drive very far. The battery is only for starting the car. The alternator provides charging and electricity once started.

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macphanatic
If the charging system is bad, you won’t be able to drive very far. The battery is only for starting the car. The alternator provides charging and electricity once started.

True, but with this pandemic, I suspect his car was just fine and then sat idle for 2 months: I am getting ready to bring in 2nd car for service.

if that is the case, and the charging system was good 2 months ago, then I would suspect battery first. if a cell drops well below 2V, it is hard to recover from what I understand.

I suspect many of my neighbors will have this issue. several cars didn't move since mid March.

nah, I've been running it and driving every week since Jan.
At least 15 to 30 miles each time.

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Quote
macphanatic
If the charging system is bad, you won’t be able to drive very far. The battery is only for starting the car. The alternator provides charging and electricity once started.

You might be surprised how far you can drive without an alternator! I did it once (with great trepidation) for 2.5 hours, almost 150 miles, with everything electrical in the car like the vent fan turned off.

Batteries have a reserve capacity. Essentially how long they will operate a vehicle with no charging system and a 25 amp load. On an older vehicle where the only power draw is the ignition coil, it can be several hours at highway speeds. Like tenders, I got several hours on my old 4 door '72 Skylark. Slightly more in an old Ford Maverick.

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.....can one do a 'Freaky Friday'........???

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I reject your reality and substitute my own!

depends where you attach the jumper cables.

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“A sword never kills anybody; it is a tool in the killer's hand.” Seneca the Younger

The police have no duty to respond. See Castle Rock v. Gonzales, 545 U.S. 748 (2005) or Warren v. District of Columbia[1] (444 A.2d. 1, D.C. Ct. of Ap. 1981)

Judge Lee wrote that “we cannot jettison our constitutional rights, even if the goal behind a law is laudable." 9th Circuit Court of Appeals

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it was just the batt. but never satisfied, on the way home I dinged the back step of a Merc Sprinter. He barely got out of the vehicle to look.
I however need a new front bumper cover. lovely..

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proofraed by OwEn the c@t.