The 8.53 volts at the magnet may be totally normal. Instead of comparing the voltage against measured battery voltage, compare magnet voltage against voltage measured on the blue wire coming from your brake controller. Or you could pull the break away switch and measure magnet voltage and that should be close to battery voltage. If it isn't, measure voltage from break away switch and ground.
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Paul Northport,AL W4XH
2013 358 RLT Mountaineer
2008 Silverado Duramax
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