How many miles on the injectors?

 

I don’t know if they’ve ever been replaced. They likely are original with 350k miles

 

It’s time for new injectors.

 

I was figuring that…. I have a set ready to go in. Unfortunately I went with Full Force which I hear is not so good these days

 

I'm going to jump in here again and tell about a repair that I did many of for people that suffered dead batteries in the winter. I used to live in Seattle and the daily commute on I-5 both ways was making good time if it moved at 15 mph on a lot of days. Definately not enough MPH to get the motor up to operating speed. In the winter, the headlights, wipers, heater, and if equipped, the AC would be on to extract the water from the air so the defrost would work better. What I found was the designers would specify a good alternator, but the charge circuit was less than adequite to keep up with demand. Some of the older vehicles had aluminum core wiring in the alternator wiring harness, as well. With no load on the circuit there would be adequite voltage at the battery, but as soon as you turn on some accessories, then there would be a huge voltage drop between the alternator and the battery. 14.25 at the alternator and 13.5 at the battery. What I did was to either replace the entire wiring harness with heavier guage copper core wire, or in most cases, simply install another cable parallel to the existing system. Doing this one thing never failed to correct the customer's issue with a dead battery next morning, even in the brutal conditions of a slow commute and just about ever accessory turned on. The alternator itself is able to keep up, I've found, but it's usually the wiring where the culprit lies.
It's the same issue with our trucks, is my opinion, and I installed the same setup on my 550 a very long time ago, the first thing I noticed is the dashboard volt meter sits at a higher voltage than it used to. I have 14v at the battery posts with everything on and the PHP chip set on high idle 1400 rpm. I believe that you will find this a worthwhile investment of your time if you decide to install something similar.

The 4 guage wire with the red heat shrink on each end plus wrapped in split loom for protection. One at the battery positive post and the other end at the alternator output post.

2 guage ground wire. The other end goes to one of the bolts holding the alternator down.

 

I totally agree,
my Alternator has 00 wire to the battery post



and it regulates at 14.4 to 14.8ish

 

I would ditch (sell) the FF injectors and talk with either @Bitterroot Diesel or @DZL JIM about rebuilding your originals or going with an all new set.