Hello, I finally changed out my QF850 for a Holley EFI system with a new fuel tank and electric fuel pump. I also added in an electric vacuum pump for my brakes at the same time. At the time when we did the install, I didn't address the alternator and paid the price with fouled out plugs after a short period of time. In speaking with several Buick people, Bob at Imagine Injection, and a couple electrical folks it was determined that my stock, who knows how old alternator needed to be changed out. I picked up a 100 amp from Quality Power alternators. My question is: Does anyone know or can suggest, based on our Buick wiring, what needs to be changed as far as wiring / grounding? I changed the lead wire from the alternator (BAT) to the fuse box on the firewall back when I did the motor swap in 2008 ... eliminating the resistance wire. I'm pretty sure I used a 10awg wire. Other than that, it's the same externally regulated 10dn wiring with the exception of an inner fender mounted Ford type solenoid for easier starter wire access and longevity. I found a place called CE wiring online and spoke to Tony there. I know I want to change the battery cables (2 awg), ground to the fender (8awg) from the neg battery connection. Has anyone else upgraded their amperage and learned any gotchas that must be done? Do I need to run a secondary wire from BAT post on the alternator to the solenoid? Somebody had suggested that to me.
I have not done an alternator update to mine yet, as the stock one still works fine. Here is an article that may help you out though: http://www.buickperformanceclub.com/alternat.htm
No matter what alternator, you need sound bonding and grounding. The engine, body, panels, frame, supports, need to be grounded/bonded as a unit (many to many) and all powered accessories/devices need to be properly grounded/bonded to their respective mounting points. After that, having adequate gauge wiring/cabling for battery (+-), alternator voltage regulator. All other components will be fine, unless you install accessories/devices that draw greater loads.
Thanks Rich. That's a good article but I didn't convert to an internally regulated type. I stayed with the old 3 wire externally regulated style. -Scott
