I picked up one of these today at Walmart for $15 today to monitor my battery and make sure my new alternator was doing its job. It plugs right into the cig. lighter.
http://www.amazon.com/Equus-3721-Battery-Charging-Monitor/dp/B000EVWDU0
You can actually see what the alternator is doing while turning on all the electrical loads while driving.
http://www.amazon.com/Equus-3721-Battery-Charging-Monitor/dp/B000EVWDU0
You can actually see what the alternator is doing while turning on all the electrical loads while driving.
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