Strange battery charger operation?

Pskhaat

2005 Expedition Trophy Champion
On my last trip, I burned out some old aux. battery cable. In the meantime I've been keeping the aux. (and a few other batteries I have) charged via two older Craftsman float chargers (1.5A). They both have worked flawlessly for many years.

Now when I charge ANY battery both of these chargers audibly click on and off, cycling every 15-30 seconds or so. I know they turn "off" because I have an after-run fan that I can hear the fan speed change when they're on. However if I connect a voltmeter to them they show consistent 12v.

I'm pretty sure these charges don't modulate their charge.

What would cause pretty basic 12v chargers to cycle like this?
 

spencyg

This Space For Rent
I only get this condition with my cheepo century charger when I'm attempting to charge a cooked battery....

Spence
 

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