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Qwimby1 · 10-28-2023, 01:34 PM

Car has been running beautifully since I installed new Big Crank deep-cycle batteries, but I'm getting strange voltmeter readings. I can only see the meter at night so that's when I do my testing. It usually starts at 28.3, but when I activate the compressor the readings are very different than they were with the previous batteries. They'll drop sometimes to about 21.1 or sometimes as low as 18.1 but then stay right at that point even while the compressor continues to spin. It's working fine, but I think that as long as that blower is turning it should be reducing battery voltage. For whatever reason though, I'm getting consistent boost and it doesn't stop running so I guess it's just different characteristics of different batteries.

I think I'll adjust my throttle switch to bring in boost at 50 and 70% throttle. I still have something going on with WOT. The butterfly opens completely and throttle body is clean, but my absolute throttle position according to my OBD, indicates 80.1 max, and it doesn't feel like I'm getting full throttle.

10-28-2023, 01:34 PM	#11292
Qwimby1 Senior Member Join Date: Nov 2015 Drives: 14 FRS Monogram, 05 Mazdasped Miata Location: Sarasota, FL Posts: 571 Thanks: 133 Thanked 144 Times in 106 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Strange voltage readings Car has been running beautifully since I installed new Big Crank deep-cycle batteries, but I'm getting strange voltmeter readings. I can only see the meter at night so that's when I do my testing. It usually starts at 28.3, but when I activate the compressor the readings are very different than they were with the previous batteries. They'll drop sometimes to about 21.1 or sometimes as low as 18.1 but then stay right at that point even while the compressor continues to spin. It's working fine, but I think that as long as that blower is turning it should be reducing battery voltage. For whatever reason though, I'm getting consistent boost and it doesn't stop running so I guess it's just different characteristics of different batteries. I think I'll adjust my throttle switch to bring in boost at 50 and 70% throttle. I still have something going on with WOT. The butterfly opens completely and throttle body is clean, but my absolute throttle position according to my OBD, indicates 80.1 max, and it doesn't feel like I'm getting full throttle.