2007 Chevrolet Silverado 1500 Classic, Remote Start Trouble

I have installed about a dozen Ultra starts of various models in my own vehicles over the years. Until now, I have had really good luck. My body type looks like a classic, but the wiring diagram matches the newer body style. I only have one ignition wire(pink). I have verified all 7 of the ignition harness wires to hook up the remote start(1280). I am using an old Fortin INT-SL-PL module and have the two connected through the 4 wire connector. Tach wire on the module goes to the pink ignition wire, purple goes to the OBD pin 2 connector, and tach wire is going to pin A5 on the instrument cluster. I got an AC signal off of that wire and I saw it was a possibility as a connection on a wiring diagram. My problem is that after I program the module, I can remote start it once. The dashboard tach bounces around and it shuts off like it can't find the tach. It tries three times and then gives me the tach error. Also, the "service 4wd" shows up in my display. If I unplug the bypass module tach wire, tach goes back to normal.   I had tried at the injectors using the non-common wire but then I would get a misfire with the bypass module plugged in. Lock and unlock work great through the bypass. I just seem to be missing something. I really installed this unit because I had a spare remote start and spare module from a while back and wanted keyless entry to work better than the 5 feet I was getting with the original remotes(even with new batteries). I appreciate any help you people could give me. Thank you.Wherever you go, there you are!

Does your trucks under dash wiring look like this vehicle? https://www.the12volt.com/installbay/forum_posts.asp?tid=133000 Did you power the trucks White IGN2 wire with the U1280's thick White programmable ignition output wire?Soldering is fun!

Thanks for the reply. No. This is not what mine looks like. There are no white wires in the harness at all. Nothing large or small. This morning I experimented with cutting the tach wire from the bypass module and wired the tach wire from the remote start. It starts and runs now, but throws ABS and service 4wd warnings. This pickup chassis was made in November of '06, but even though it looks classic, it doesn't have the same wiring as what is listed for a classic. I can only fine ONE ignition wire. I am almost certain that this is where my error is, but it just doesnt' seem to be there. I can post a pic if that would help.Wherever you go, there you are!

I took some pics, but I am not sure if I am just to post in the downloads section if it is just pics of the problem or if it more for informational. I don't want to clutter it up. Mine is a 1280TLXR PRO remote start. I either put 1280's or 1272's in. Just my vehicles. I don't do this for hire. BradWherever you go, there you are!

According to Fortin, ignition 2 is in a different harness: https://cdn02.fortin.ca/download/61111/evo-all_ig_reg_bi_gm_escalade-avalanche-silver-sierra-h2_j1850_2003-2007_a_61111.pdfMy ex once told me I have a perfect face for radio.

Thanks geepherder! I will check that out tomorrow. Will post what I find.Wherever you go, there you are!

My vehicle is not configured this way at this 6 pin harness. Pin B in that harness is a very small gauge green wire that doesn't carry positive voltage like ignition should. Pin F is a brown colored wire instead of Orange, but i am using it to power my accessories. Wherever you go, there you are!

I am so confused.. it should be pretty obvious if you have a classic / new body style.. as the wiring is completely different.. the new body style, uses thin wires and has a pk3 connector. the old body style uses heavy gauge wires, and you must hook up the 2nd white ignition wire. (my experience it's may not be with the main harness bundle, but usually next to the brown radio accessory wire.. Can you attach a pic of the cluster / main harness?

Since I am new, I have to post in downloads section. Is that correct?Wherever you go, there you are!

I found where to do it here. Will work on it right now. SorryWherever you go, there you are!