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No so fast. The problem seems to be solved, but not through my diagnosis of a bad pump. Instead I got a reminder to thoroughly rule out easier fixes.
When I was checking the pump, I reseated the power and ground connectors to the pump several times, but still got no action from the pump. Since i could measure 12v accross the connectors I figured the pump was bad.
Once it was out I started testing the pump. It seemed intermittant so I was ready to order a pump and go to bed but decided to try a bit more. With better jumpers to the battery and decent alligator clips on the pump terminals, the pump ran fine - and with lots of starting and stopping I couldn't find any dead spots on the winding like I've had with electric fans.
I stuck it back in (twice because I forgot the check valve the first time) and it run fine since. That was a week ago.
I can't quite figure how a bad electrical connection would have a fairly predictable cyclic action (bad during cold start, going away at some point during warm up), particularly in an area that doesn't get much heat. But for now it seems fixed.
thanks
joe
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