Yes, as Gord says, may need a diode or idiot light. I have a link to a kit for that. $10.
Bartamos - I might have missed it but I did not see your link to the "kit" you referred to earlier in the conversation. I am a few weeks away from rewiring my 50 3100 with a new harness and new alternator and would like to avoid any problems!
Thanks in advance.
