R3cord303
Posse In Effect
Just a diag today
What did you do to your NNBS GMT900 Tahoe/Yukon Today?
- Thread starter phattyford
- Start date
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iamdub
Full Access Member
Replaced the TJ coils with the Belltech 5305 coils. Meh...
kbuskill
***CAUTION*** I do my own stunts!
Any noticeable difference in height or ride?
Why? I didn’t realize there was any issue..?
iamdub
Full Access Member
That's why I finished it with "meh". They MAY be a little softer than the TJ coils. MAYBE. When I finished, I took it around for an aggressive shakedown including large dips and humps at speed to get the body cycling up and down a lot and did some really hard slalom-type steering to rock it side-to-side. Was trying to settle them as quickly as possible. It handles great- very planted and recovers immediately, but so did the TJ coils. I can barely tell any difference in the ride quality. As expected, they're noisier since they have 4 dead coils. But, that may fix itself after the surface rust gets rubbed off, so I'm not so concerned with that at the moment. When I got back home and parked it, it was sitting 3/4" higher than the TJ coils. I'll check it again tomorrow, but I'm not expecting much change. Since it has those dead coils, I can trim the springs to get that 3/4" of drop back and not change the ride or capacity.
I'm tempted to take a flap disc to the McG coils to reduce the wire size a hair to weaken them and see what that leads to. They're advertised as a 3" drop but I got right at 2.5". I only ran them for about a day, though. Maybe they would've settled closer to 3" with some more drive time and I did the same shakedown with them as I've done with all the springs. I'll check with my buddy to see if he's worked on any more TJ suspensions (Jeep/crawler fabricator) and has another set of those coils. I'd rather experiment with them than the McGs. But, I don't wanna mess up my only set of TJ coils since I at least know I like them well enough so I'd cut on the McGs first given those two options.
I don't know why everyone says the 5305s tend to be too soft. They're still considerably firmer than stock.
R3cord303
Posse In Effect
Welp. Dealer told me i need a $650 underhood fuse block and didnt charge me for diag. Tech forgot his electrical tape in my engine bay. I drove it home. Now i’m trying to figure out how to pull the fuse block out so I can take it apart and figure out how to make the wipers work.
iamdub
Full Access Member
I want a relatively "cushy" ride from drop coils since I want to reimplement the ALC system, but with Air Lift bags inside the coils instead of the factory sleeve-on-shock design. Supposedly, a common complaint is how soft the 5305s are and they drop 4", so they should've been just what I wanted.
I even compressed my shocks to verify that the specs weren't incorrect and I wasn't just bottoming them out. Speaking of shocks, the Belltech SPs I have were easier to compress than the stock ones, so they're not the reason for the firm ride.
R3cord303
Posse In Effect
Update: i reseated the junction block in the mount, didn’t help a bit. Looked online and one from gmpartsdirect is $254 with 24-72 hours to ship, and 5-7 days to delivery. A 3rd party one is 188 and who knows what their availability is or when it would arrive. Soooo i’m trying to take tomorrow morning or afternoon off from work so I can get to the parts yard and pull one from an 07-09 LTZ tahoe for hopefully $20-$50, i’ll swap the fuses over, and see if that helps.
what googling around online seems to say is that the ground strap that goes from the body to the back of the engine gets too much dirt/corosion on it over time, and you start having backup lights/intermittent tpms lights or radio static/popping.
For the past month I’ve been having tpms and radio intermittent issues. Sooo I’m gonna add another body ground and run it to the alternator bracket and maybe see about replacing that ground strap.
what googling around online seems to say is that the ground strap that goes from the body to the back of the engine gets too much dirt/corosion on it over time, and you start having backup lights/intermittent tpms lights or radio static/popping.
For the past month I’ve been having tpms and radio intermittent issues. Sooo I’m gonna add another body ground and run it to the alternator bracket and maybe see about replacing that ground strap.
I was going to say, take it apart probably just some burnt contacts, there just going by the shop manual like I said earlier bcm or fuse block
looks like connector x5
then pins j1, k1, k3 are what you want to check
R3cord303
Posse In Effect
I’m going to go to autozone here in a bit for some wire and ring terminals- what do you think some ways to bodge it together would be?
good question, I guess it depends on what condition the connector is, if it's burnt and melted it might be best to just put in a used one or bypass it somehow, if its just corroded or has minor scorching you might be able just clean it up and put in some better grounds like you mentioned.
Fuuug...
R3cord303
Posse In Effect
@Doubeleive so it sounds like pins K1 and K3 go high when wipers are on depending on the setting, and then those go thru the fuse for the wipers, and then in turn, make J1 go high when the wipers wipe correct? so... a T tap on K3 with a fuse that then goes into a T tap on J1 would "work" right?
I would order one of these to have around for future refernce
https://www.ebay.com/itm/GMC-Yukon-...669554?hash=item2f36bab8b2:g:cCsAAOSwqf1dXufz
that's what it says the connectors are in the service manual yes
j1 is high speed control (purple)
k1 is high signal (tan)
k2 is switch signal 2 (grey)
k1 is high signal (tan)
k2 is switch signal 2 (grey)
R3cord303
Posse In Effect
Does it list which wire actually goes to the wiper transmission?
R3cord303
Posse In Effect
Also thank you so much @Doubeleive for your help. I’ve been stressed all day about this and combined with wayyy too much coffee
I don't see anything it might be because of the high speed lan (serial bus) that they use, you might try looking at the upfitter guide they usually have some good wiring diagrams
you might be able to get them working temporarily using the tp92/95 that I posted earlier I just looked in my fuse box I would imagine either one of those pins would either take 12v or a ground, you would need to check the pin to see if it it's hot or not, then hook up a toggle switch, janky but it would give you wipers (i think)
