Runs like top! five speed in, need to have rear driveline made but got all wiring and gauges and almost there, one more day and I should be driving, lots of little bugs to still work out have to wire up transfer case went with manual so wireing different from auto 4x4, wiring always slows me...
I fought by suburban starter for a year hard slow start, finally got a good one and bam start fast, but two good battery's is key, test both indivually, good glow plug system, and I usally up size all my battery cables, and lift pump, just cause it's purring doesn't mean it's pumping enough
Watched your video I put a horn button to siloid, to manual control glow plug circuit, I use a ford one like ford uses to fire there starters, can be found in any junk yard, your light cycled fast meaning not enough time on glow plugs, watch video of veggie guy he hold glow plugs for ten...
Test each glow plug, pull, ground body of it to batt and positive to tip should glow in 5 to 8 sec easy only 20 minutes of your day, if you have 200000 miles you need injectors not to say that's starting issue but you won't regret it
I found wd40 isn't what it used to be doesn't have any punch anymore, but check all glow plugs when i lose two I have a harder time starting, but check fuel got fuel? Open t valve, crack injectors, and then like ak diesel said use some ether but unplug glow plugs if you have space heater...