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Remove all the cables from the rear battery and see what it reads post to post... I highly doubt that it is truly at 20V. Just out of curiosity, is your multimeter an automatic ranging one? It might be reading something other than volts (like Milivolts or something). At 20V across the rear...

The rear reads 20 across its own two posts or across both batts? If it's 20 across itself, that battery is severely overcharged. If it's 20 across both batts, it's severely undercharged. From terminal to terminal on the rear battery it should read between 12 and 14V and across both batteries it...

Ask for two A/C relays for a 1990 Jeep Cherokee. They're just standard Bosch relays. They might have a mounting tab that the original doesn't but you can just break it off with a pair of pliers. Later, Joe