Dakota Digital cluster: 2 wires
Dakota Digital cluster: 2 wires Hello all,
I'm installing a Dakota Digital analog cluster in a 1978 Caprice. I have the adapter to wire the harness into the OBD2 port. Two questions I have about my wiring harness:
Thanks,
Brandon
I'm installing a Dakota Digital analog cluster in a 1978 Caprice. I have the adapter to wire the harness into the OBD2 port. Two questions I have about my wiring harness:
- Pin 46 is the MIL (check engine light) wire. Since the Dakota unit has a check engine light built into it, should I delete this wire or will it need to be run to the cluster someway for the cluter's check engine light?
- Pin 50 is the vehicle speed signal which normally would be run to a cluster, but since I will be using the OBD2 port, will I run this wire to the obd2 connector or is this wire not needed because the serial data wire will give all the info that is needed to the cluster?
- Pin 54 is the fuel level sensor signal, which is only used for fuel gauges controlled by the pcm. I'm not sure if this applies to the Dakota Digital unit or if the cluster will get this info from the obd2 port.
Thanks,
Brandon
TECH Enthusiast
Joined: Nov 2016
Posts: 711
Likes: 6
From: PNW
No wires go to the OBD port other than the serial wire and a ground wire. That port is not a connection for anything else. As far as what wires the dash needs, that’s going to be in the instruction manual and has nothing to do with OBD port wiring.
u can go through and select how u want the cluster to receive/display data. U can use the obd2 port for the speed part. Fuel gauge will need to be wired into the main black box. The fuel level is separate from the engine stuff. As for the ses light, it will need to be wired into a idiot light. One side will have fused 12v key power, the other side connects to pin 46 (which is pcm triggered ground).
Teching In
Joined: Jun 2006
Posts: 37
Likes: 4
From: El Paso, TX
Based on your list and assuming you are using one of their VHX series gauges for that car, you would have to do the following:
1. Hook up pin 46 to the control box. This will let the display indicate when you have a check engine light. It might come out with the OBDII BIM box but I would still wire it in.
2. You are correct about pin 50. The BIM will feed speed to the control box along with engine temp, oil pressure (if it's still hooked up and your harness has the plug for it) and tach.
3. Pin 54 would work if you had the original LS GM fuel sensor hooked up to the harness but I have yet to see any harness include that unless you asked for it specifically. And it requires two wires, pin 54 and pin 23 (ground reference). Another problem is that a stock GM sender for LS engines reads 40 ohms at empty and 250 at full. It's easier to just hook up the single wire from your tank to the control box.
Hope this helps.
Alex
1. Hook up pin 46 to the control box. This will let the display indicate when you have a check engine light. It might come out with the OBDII BIM box but I would still wire it in.
2. You are correct about pin 50. The BIM will feed speed to the control box along with engine temp, oil pressure (if it's still hooked up and your harness has the plug for it) and tach.
3. Pin 54 would work if you had the original LS GM fuel sensor hooked up to the harness but I have yet to see any harness include that unless you asked for it specifically. And it requires two wires, pin 54 and pin 23 (ground reference). Another problem is that a stock GM sender for LS engines reads 40 ohms at empty and 250 at full. It's easier to just hook up the single wire from your tank to the control box.
Hope this helps.
Alex
