Flat battery or battery cable issue is where I would start.

I always keep one of those 'free with coupon' Harbor Freight DVOMs in my vehicles just in the event I need to do a quick charging system diagnosis or check something for continuity.

Fully charged battery is about 12.60V and fully discharged around 11.7. I try to replace batteries after the free warranty replacement period is over. Which is every three years for me. Weather fluctuating between the low 100°F and upper teens is hard on them.

Good luck and keep us posted.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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