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Jeep Wrangler - Restoration & Custom Outfitting
All photos, diagrams, and text on this page Copyright 2013 - David Todeschini - all rights reserved - see Copyright Terms

 

Dual OBD Port

 
Dual OBD Port Wiring Diagram

1996 and later model vehicles are equipped with an On-Board Diagnostic (OBD) port, which enables a service technician to connect a Diagnostic Monitor in order to retrieve engine diagnostics data for the vehicle.

The OBD Port connects to the vehicle's "computer", and this enables a variety of devices to be connected, such as an EcoMeter, Bluetooth devices that send vehicle data to your Smartphone, and a unique device from Progressive Insurance called "Snapshot".

This diagram shows you how to modify two OBD Port extension cables (available on eBay) to make a Dual (or triple) OBD port. So long as connected devices do not exceed the port's ability to supply power, and are not WRITING data to the vehicle's "computer", it is possible to connect more than two devices to the OBD port simultaneously.

 

Dual OBD Port mounted on Jeep Wrangler sidewall under dashboard

When you want to use two or more OBD-Port devices, simply buy as many OBD Port extension cables and connect them in parallel as shown in the above diagram. Be careful to match the color-coded wires, as a misconnection can cause real trouble. Strip 1/2" of insulation from the wires of an intact cable, and wrap and solder the extra port wires to the stripped portion, using Teflon Tape Thread and nail polish to insulate each connection. If you use standard electrical tape, the joints will be humongous.

1997 Jeep Wrangler OBD Port

Use two L-Shaped, 3/4" wide pieces of brass or aluminum to fashion a bracket for the extra port sockets, and use PC-7 Epoxy to fasten them to the brackets. Find a place under the dashboard to fasten the brackets and plug in your OBD components (photo above).

Plug the male end of your adapter into the OBD Port, and make sure all of your devices are working (photo left).

 

If you only need TWO OBD Ports, or don't want to solder connections, another alternative to building your own is to buy an OBDII Port Splitter from Amazon. You will still need to secure the two female sockets somewhere (as shown in the photos below).

 
 

Use soldering flux when soldering electronic connections, heat the connection properly and do not move the connection until the joint cools. "Cold" solder joints can be intermittent, causing very erratic and unreliable operation of your equipment. See Soldering Tutorial on Wikipedia.

Get OBD Port extension cables on eBay.

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