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Thread: Battery Voltage and LS3 Engines
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05-31-2023 #1Registered User
- Join Date
- Sep 2017
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Battery Voltage and LS3 Engines
I have a 68 Chevelle with a LS3 cruise and connect kit installed. I’ve learned I have a battery draw somewhere so the battery basically dies. Voltage gets down to 9.5V and as a consequence the engine does not start. The last couple winters I’ve had a trickle charger on the battery and it keeps the battery around 12.5-12.9V. Car starts no problem. I bought a large battery charger a couple days ago to get the batter up from 9.5V back to 12.5. I measured the 12.5V with the charger connected. Disconnect the charger and voltage drops to 11.5. Charger says it charged. Car does not start at 11.5V. So my question is, are these LS3 engines that finicky that it needs 12.5V or am I missing something.
Thanks in advance,
Perry
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Sorry, I forgot to say the battery I’m using is a optima yellow top
perry
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05-31-2023 #2