2007 Ford F250 Remote start

I'm trying to verify the tach wire.  2007 Ford F250SD King Ranch Diesel 4door 4 wd. One source (Directed) says it's a LG/W in a bundle behind the fuse panel however that wire is in a bundle of PTO wires and marked CTO and it doesn't work as a tach wire.  Mobile Information Labs says its pin 48 on the PCM.    Who's right?Joe

Meter it and verify, tech diagrams are just to get you in the right direction.

Thanks Jeremy.  Here is the rest of the story.   My wife gave me as a birthday present a Python 1400XP remote start installation included by Circuit City.  I just bought a new truck, 2007 Ford F250 Diesel.   I traded in the exact same truck except it was a 2004.  I installed the remote start on the '04.   To make a long story short, the installation is a cluster *&%$.  It took them 2 days, I 've been back twice since.  There is nothing about the installation that complies with the instructions nor good standard practices.  Circuit City used the LG/W wire for the tach wire and it doesn't work plus it is contrary to the diagram that I have on the '07 wiring.  I'm looking for more data to confirm the wiring.  At this point I know how to fix the wiring and the programing but it should be done by Circuit City.  If I had it to do over I would have installed it myself.   I think it might be risky to have the Circuit City guys change the batteries in a flashlight.  Joe

According to Shopkey the PTO tach wire should be #6  (orange & yellow) in the PCM on the left side of the engine compartment. I have heard of needing a data tach module on some diesels, they send data signals on a computer bus rather than an ac signal. Since I haven't run accross this myself yet that just a thought.  Good luck!Ed

joesiohd, If the vehicle has not change much from the 2006. The location of the tach wire may be useful to you. "On diesel vehicles the tach wire is lt. GREEN / WHITE in a 5 wire harness held up with white tape behind the parking brake release." Not to put salt on the wound. Bad practice on your part to be putting gagets on a 2007 toy when 2007 is not here yet. Sometime, a bulletin are put up about a certain problem or a bug on the vehicle. It's better to have these things corrected first before you go ahead and install aftermarket product. I often remind my customer to wait about a year before putting anything on their vehicle to avoid any bad meeting with the dealership.   This auto industry in general is big for the BLAME game when things don't go right. As for bad installation work. If you want a peace of mind, I would get a second opinion and have it check over at any goverment run inspection site. If it turns out to be bad as you have said. I am sure you can get your money back from the place that install it for you. Sometime everything is bad in your eyes when you have paid a certain amount of $$$ and things aren't working like they should. Again, as an installer, this is often the case when there are limited amount of available information on newer vehicle.        Be careful whose advice you buy, but be patient with those who supply it.

You may have the correct answer, because while Circuit City is trying to figure out how to fix thier mess I have reprogramed the controller to use Low Votage sense to verify engine start and that works. Joe

Do yourself a favor and get a 454t tach signal generator for that truck. The 6.0 liter diesels put out a weird tach signal that the DEI starters dont always like. I have run into several of these and the 454t works every time.

f150fan wrote: Do yourself a favor and get a 454t tach signal generator for that truck. The 6.0 liter diesels put out a weird tach signal that the DEI starters dont always like. I have run into several of these and the 454t works every time.

Thus the problem with DEI.....I guess they DON"T know everything huh. Get you hands on an Astroflex, once you install one of these......you'll never go back to DEI! (Even though they own Astro....)