Dead battery red sentry light

[mgrowc1]

Random question but I am confused since we have two batteries. Had to jump my jeep off the main battery as wouldn’t start. Firstly does that mean my main battery is dead and the ess is ok? I’m confused now as the red sentry light is still on so I’m hoping that goes away with a new battery?

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[mgrowc1]

Well the light went off when I restarted it so I am gone there. Will get a new battery tomorrow hopefully.

 

[58Willys]

Make sure your charging system is charging the batteries before assuming the batteries are bad. Check cables connections and grounds. If charging and cable connections are OK, load test the batteries separately. Make sure to replace both main and aux batteries at the same time, as one bad battery can kill the other one.

 

[mgrowc1]

The dash says it is getting the right volts so I think I am good there. I was only going to change the main. If it gets killed because the aux needs to be changed I guess I have warranty for that so should be good.

 

[Reinen]

Always replace both Main and Aux at the same time. They work as a pair. If you only replace one at a time you will go through batteries much faster than you should. To maximize lifespan, Main & Aux must always be the same age and wear.

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