First post here, I just did mine yesterday, took about 15 minutes including soldering. I used the yellow/green stripe wire. Under the steering column they are all labeled, PTO is the one I used, to #3 switch which is labeled also, stripped them, twisted them together, and added a little solder and black elect. tape. Started truck and flipped the switch and 1200rpm's. Works great every time.
Something with the 08's and 09's with the heavy duty or dual alternators is it only revs up to 900 instead of 1200 when hooking up to the BCP wire. I thought I hooked to the wrong wire, but I seen others had the same problem on their trucks. I am going to add a 10k resistor and see what that puts me at.
It has nothing to do with dual or single alternators, it has everything to do with when the vehicle was manufactured and what strategy is programmed into the PCM.
Starting with vehicles manufactured on or after 11/06/2007, the BCP strategy was changed on all F250-F550 trucks to ramp base idle up to 900 RPM with BCP engaged, and then if charging demands require it the idle can be ramped up to 2400 RPM by the PCM.
The E250-E450 vans still ramp up to a base idle of 1200 RPM with the BCP engaged. This difference is more than likely related to the fact that the E-series vans are used as a platform to build ambulances.
The original QVM bulletin i posted back on the first page (post #3) was Q-162 dated 07/16/2007, it was revised to Q-162R1 on 11/06/2007 to coincide with the BCP PCM strategy change implemented from that date forward. Q-162 & Q-162R1 are the SEIC strategies for 2008 MY F250-F550 & E250-E350. If your 2008 MY was built prior to 11/06/2007 and it has never been to the dealer to have the PCM reflashed then the original strategy of Q-162 will be in place. See page 6 of all bulletins
Hey guys, someone had a link for aftermarket upfitter switches on this site and I can no longer locate it. I do not have the upfitter switches in my truck and instead have a coin holder. This link had the switches for the 2008 reasonably priced, much less than ford which isn't hard to do. If anyone can help me locate them it would be greatly appriciated. Dave.