Battery Maintainer Not Charging Connected to Cobalt Remote Terminals

My Schumacher Battery Maintainer has worked fine for several years in keeping the battery charged in my 2014 Honda Civic. The first time I've used it on my 2010 Chevy Cobalt (attached to the remote terminals under the hood), the pulsating green light that indicates "fully charged" has not come on after 12 hours.
Is there something wrong about charging via the remote terminals?
Is there something wrong about charging via the remote terminals?
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Comments
I didn't hunt far for a suitable place to make negative or ground connection. Since the Cobalt battery is vented to outside the car, I connected to the battery negative terminal.