Here is a thread on ignition switch issues I have experienced.
I would suggest doing amperage checks on individual conductors with a clamp on style ampmeter. Only turning the power on long enough to get a reading then power off before changing conductors. You want to avoid damaging anything. Start with the power supply to switch.
Something is drawing too much amperage! It could be from a bad ignition switch or as this is a new installation there may be a wire that is somehow partially grounded causing the increased amp draw.
Don't assume that the harness or any other new component is not at fault. AAW makes good products (Heck I have an AAW harness on my Burban.) but, anybody can have a bad day.
Does the problem occur in both ON and ACC? Or is it in START only? Answering these should help us help you find the problem.
Do you know if the harness uses the original color coding the factory used ?
https://67-72chevytrucks.com/vboard/...d.php?t=818861
Good luck and keep us posted.
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread
http://67-72chevytrucks.com/vboard/s...d.php?t=698377