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How To Determine If I Can Use CM7000 Low Current Wiring Harness?

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Copper - Posts: 80
Copper spacespace
Joined: January 13, 2010
Location: Florida, United States
Posted: January 09, 2021 at 11:17 AM / IP Logged Link to Post Post Reply Quote ace_boy2099
I'm looking to install a CM7000 (among other add-ons *Cruise Control and Autolights*) into a 2017 Ford Transit 350 (No PATS) and was wondering how I would distinguish if I can use the thinner "low current" connector (cn3) or if I have to use the Regular/"High Current" CN1, or if I'd have to get the low current CN1 (FT-LC1, I think it was called; What's the difference between the LC1 and CN3?). all the wires under the dash going to the BCM and up the column are all really thin, a lot thinner than my 99 F150 or 05 Superduty were, going by that I'd assume I could use the Low-current setup but don't know for sure, and don't know how'd I'd test to verify for this.
I was hoping to try and start on this today or tomorrow so if anyone has input for me I'd appreciate it!!
Platinum - Posts: 7,574
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Joined: January 30, 2009
Location: Pennsylvania, United States
Posted: January 09, 2021 at 12:06 PM / IP Logged Link to Post Post Reply Quote kreg357
One way to tell is to check the vehicles current rating on the +12V constant wire in the ignition switch harness connector. In the case of the 2017 Transit, it is a Blue/Red wire rated at 15 Amps. Now take a look at the fuse on the +12V constant input lead CN3 Pin 2. It is 3 Amps. Definitely not a good match. On that Transit, you have (+) Parking Light circuits and the CM7000 has a siren instead of a low current (-) Horn. I'd use the CN1 high current harness for that vehicle. Get your (+) 12V constant power from this wire at the SJB :
12 Volts     Yellow/Red (60A)     +     BCM-Dash Fuse Box, black 2 pin plug (A), pin 1
You can gauge down the ignition wires to 18 gauge and run those thinner wires to the Transits ignition wires for an easier connection.
Soldering is fun!
Copper - Posts: 300
Copper spacespace
Joined: November 21, 2003
Posted: January 11, 2021 at 9:26 AM / IP Logged Link to Post Post Reply Quote silvercivicsir
low current cars are usually not always but 95% Push to start..

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