Voltage reading 11.9 running

Jonny Mach 1

New Member
Mar 27, 2020
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I recently had a battery drain completely on me and switched it out with a yellow top optima. Car ran fine but plugged in my sctx4 to read volts and running and driving was only around 11.9-12.4 volts at the most. Any ideas on what’s causing this?
 
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Neuron

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Nov 6, 2016
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I would check all the connections, especially grounds, and get the alternator tested.
 
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7991LXnSHO

wanna catch the space herp
10 Year Member
Sep 1, 2010
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A charged battery should read 12.6 or above. And when charging, You should get 13.7- 14.7 volts.
Have the FLAPS check the alternator while you check all the connections and cable ends. The cables can be corroded under the plastic insulation, so the voltage drop test is a good idea.
@General karthief can you find the checklist or writeup on checking voltage drops?
 
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General karthief

wonder how much it would cost to ship you a pair
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It's in here:
 
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