Red Light ON -> How to tell if its the alternator or Regulator

[sblu]

i see that folks transfer over a small piece of plastic (Garolite) from the older alternator to the new one. I don;t have that piece on the older alternator. With the precautions I've taken (cut holes to clearance the B+ terminals) and also to cut down the posts, do I still need to put this insulator in? I dont fully understand the current path that this was trying to avoid if the posts were cut down.
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1978 Westfalia Champagne Edition Project

[sblu]

folks how critical is the 'alternator sealing ring' (#30)? this is the photo I have of the 'before' i took it apart, and it seems like it was always missing (can someone confirm if its supposed to be there for a '78?). Seems like I'm also missing bolt (#47)

best photo I have of the 'before'

bentley photo showing #30, #47

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1978 Westfalia Champagne Edition Project

[sblu]

Kind of a silly question but I forgot how the alternator to starter wire is supposed to be routed! Can someone remind me? That cable and regulator plug are in the engine compartment - sharing single rubber grommet plug. How is that cable now supposed to be routed back to the starter?

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1978 Westfalia Champagne Edition Project

[sblu]

replying to my own question, there is a port located below the Fuel Pressure sensor that will allow the cable to go through the firewall and out to the starter.
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1978 Westfalia Champagne Edition Project

[75 Westy FI noob]