J1939 Type 1 and Type 2 Pin Designations

Pin	Type 1	Type 2
A	Ground	Ground
B	Battery	Battery
C	J1939+ 250kb	J1939+ 500kb
D	J1939- 250kb	J1939- 500kb
E	J1939 Shield	J1939 Shield
F	J1708+	J1708+ / J1939+ 250kb
G	J1708-	J1708- / J1939- 250kb
H	OEM Specific	OEM Specific
J	OEM Specific	OEM Specific

Different Wiring Schemes

Type CD
	Many pieces of test equipment or GPS units are capable of handling the high data rates in a type 2 system, but come from the factory with a type 1 connector. Type CD places the High Data rate J1939 connection from Pins C and D of of the Type 2 connector to the standard
Type FG
	Many vehicles with the green connector place the older, 250Kb J1939 onto pins F and G of the new connector. The Type FG adaptor connects these pins to the standard J1939 pins (C and D) on the Type 1 Connector which will allow older units to communicate.
Type HJ
	Some vehicles with the green connector place the older, 250Kb J1939 onto pins H and J of the new connector. The Type HJ adaptor connects these pins to the standard J1939 pins (C and D) on the Type 1 Connector which will allow older units to communicate.

Wiring Connections

J1939-2	Signal	J1939-1 CD	J1939-1 FG	J1939-1 HJ
A	Ground	A	A	A
B	Battery	B	B	B
C	J1939+	C	-	-
D	J1939-	D	-	-
E	J1939 Shield	E	E	E
F	J1939+	-	C	-
G	J1939-	-	D	-
H	J1939+	-	-	C
J	J1939-	-	-	D

J1939 Type 2 Locking Female C/D to J1939 Type 1 Male Adapter
Part No	j1939-t2adap
Weight	0.24 lbs
Price	$57.70 ea

J1939 Type 2 Locking Female F/G to J1939 Type 1 Male Adapter
Part No	j1939FG-t2adap
Weight	0.24 lbs
Price	$57.70 ea

J1939 Type 2 Locking Female H/J to J1939 Type 1 Male Adapter
Part No	j1939HJ-t2adap
Weight	0.24 lbs
Price	$57.50 ea

Dual Adapters

If you look at the 9-pin green connector in your truck, you can compare the pin positions with the photos below.

Type FG
	Many vehicles with the green connector place the older, 250Kb J1939 onto pins F and G of the new connector. The Type FG adaptor has both the straight through CD connector and connects the F and G pins to the standard J1939 pins (C and D) on the second Type 1 Connector which will allow older units to communicate.
Type HJ
	Some vehicles with the green connector place the older, 250Kb J1939 onto pins H and J of the new connector. The Type HJ adaptor has both the straight through CD connector and connects the H and J pins to the standard J1939 pins (C and D) on the second Type 1 Connector which will allow older units to communicate.

If you do not know which adapter to use - whether your device supports the high data rate or if the low data rate is on pins F and G, then this adapter will allow you to try both. One Type 1 connector is wired using pins C and D of the Type 2 connector and the other is wired using pins F and G.

J1939 Type 2 Female to Dual J1939 type 1 Male Adapter
Part No	j1939-dt2adap
Weight	0.33 lbs
Price	$65.00 ea

Item#

Weight

Price

Qty

J1939 Type 2 Female H/J to Dual J1939 Type 1 Male Adapter
Part No	j1939HJ-dt2adap
Weight	0.33 lbs
Price	$65.00 ea

Triple Adapter

If you look at the 9-pin green connector in your truck, you can compare the pin positions with the photo below.

If your connector is wired like above, you may have readable J1939 data on CD, FG or HJ. This cable allows you to try all three.

J1939 Type 2 Female to Triple J1939 type 1 Male Adapter
Part No	j1939-tt2adap
Weight	0.6 lbs
Price	$84.00 ea

Don't see what you need? Check out our Custom Cables page or give us a call at 310-793-2410. We can custom make nearly any configuration to your specifications.