I think you have a Voltage regulator problem.

You sure about that 17V reading??

If YES, then change the regulator on the back of the Alt.
And don't run the car much in the meantime b/c you can fry some expensive parts at 17V. That is prolly what burnt the rear lamp. The OVP is dropping V to Engine systems b/c of over-voltage from Alt [ now you know what an Over-Voltage-Protection relay is there for ]

After the change , take another running V test and check all fuses ..and give all fuses a spin in their connectors too.

__________________
A Dalton