In some cases, the GM 10SI and 12SI alternators backfeed through the regulator excitation wire, not allowing the engine to be shutoff with the ignition switch
Kit allows you to stop alternator backfeeding by installing this diode inline on the ignition switched wire going to the regulators pin #1
Do you have some serious wiring to do? Painless Performance has the wire for you. Their Painless Performance Extreme Condition bulk wire is engineered to deliver reliability and plenty of performance. It's made with a stranded-copper core and has cross-linked polyethylene insulation that offers superior abrasion resistance, yet can still stand up to 275 degrees F and 600 V. This wire is lightweight and easily routed and it exceeds OE specifications for underhood use.