Battery light. Troubleshooting options

Motorradmark

Well-known member
This evening, got a steady, then flashing battery indicator light and voltmeter showed no charging, hovering at +12v rather than higher when normally running.
No issues noted yesterday when driving.
First going to check alternator output, then check all wires.

Any other suggestions?

Engine, 300tdi
Optima red top primary battery with yellow top as alt, hooked via NL smart solenoid.
Has been cold last few day.

Thanks
 
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