Whole electrical system low at idle…

Two problems:
bad tach signal at idle
headlights etc. dim at idle.

I've wired up a tach which at idle isn't right, it's set to 8 cylinders and getting it's signal off the + on the coil.

Also I just replaced the battery today hoping for results (it was shot anyway)

Here's a vid, please excuse the long pauses in between, I aimed predominantly at the tach as I made the vid for figuring out what's wrong with my trans;

SKIP AHEAD to 1:40 and that should illustrate my point at 4:21 also...

Also the headlights dim at a stoplight, worse when the heat is on and worse still with a turnsignal on. My stock amperage gauge drops to around -20. When I turn the heat on you can hear the blower motor slowing with each turn signal blink!

Please excuse the long pauses in between,I live in the city and those are the red lights...

http://www.youtube.com/watch?v=ldq0IaRWm28
Author: admin