If you just want to see the battery voltage you could get a simple meter from Amazon. There are several vendors.
I got one in combination with a USB and standard 12v socket for our 4Runner. Easy install and decent build quality.
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Larrie
Read detailed trip reports, see photos and videos on my travel blog, luinil.com.
Current van: 2002 Ford E350 extended body camper with Colorado Camper Van pop top and Agile Offroad 4WD conversion.
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