"Replaced the battery, no more slowly dying but the car still drains down when driving.
I started the car and put a good fluke amp clamp on the alternator output wire. It will run the blower on high, and the brights at idle. Reads about 52 amps on the display."
First we don't know the bat state of charge... I assume he just started it so the alt is working above what it takes to keep it running and trying to recharge the bat
Blower on high possible 15/20 amp draw
All lights 10amps
Fuel pump and engine management 12 amps
My numbers may be high so I will round them off.
The alt would have to put out 38 amps just to keep it running and not using any of the storage capacities of the bat... At this time the alt is charging the bat at 14 amps... All this at IDLE
It would have been a flag if the amp readings were not at least what the draw was on the battery at the time of his test... After you start it up it runs off the alt not the bat...
Alt amp out put fully loaded should be within 10% of the rated amp out put... I normally go 50 amps with a load tester and see them be right at there rating and sometimes a little more... Most of the time you have to throttle the engine up but I have seen them reach the 10% range at idle... I think he was about there when he deadheaded his windows are what ever he did...
Modern alts a little dynamo's that's why you should charge the battery if you replace them are you chance over working it from the get go... He did provide good info tho its not normally seen from the general public... He proved the alt was capable of what it was designed for... If it had a dash mounted voltmeter he would have seen when the alt went off circuit... I do wonder why his charge light did not come on...
His last question
"Will alternator's output decrease to nothing when hot if it's bad.?"
That's a two sided question depending on how you read it are take it... Of course the answer is YES... If its running it should output more than is being taking out... If not you are using your storage capacity up till its depleted...
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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