Chrysler Repair: 2002 sebring wiring, crank sensor, 72 chevelle

Question
I am using a dash and gauges from a 2002 sebring sedan in my 72 Chevelle, sounds odd but is beautiful. I have the PCM and BCM. I have no voltage coming from the BCM blue fuel sensor signal. Should I have 5v there? I have the sender in my tankand cannot get the gauge to move and it is attatched to my original pickup. Also I have a tachometer signal interface to convert my HEI signal to the crank sensor wire from dakota digital. will this work or will it fry my PCM as dakota digital said this has worked in some jeeps they have done.

Answer
Hi John,
I don't have detailed knowledge about how everything in the bcm works, but of course I have the wiring diagrams. As to the fuel sensor signal, I would believe that it works by means of applying a voltage to the sensor and measuring the current flow which depends upon the resistance presented by the level sensor. So if you have no voltage then the only explanation I can give for that is that you may not have applied 12v to all the different pins of the bcm that normally get 12v for the general operation of it: plug 1/pin12black/light blue, junction block/pin2direct connection, juntion block/pin 12direct connection, junction block/pin11direct connection, junction block/pin6directconnection. You are no doubt aware the the junction block (fuse box in the cabin) and the body control module are physically ganged together, which is where the 'direct connections' come about. What sort of wiring have you done to the bcm junction block pin connections if you aren't using the junction block too? Maybe you need to wire in 12v to all those pins that I listed above. It has 12 such pins numbered from the long side starting with 1.
The tach signal comes digitally to the cluster along with many other signals via the pci bus wire from the body controller. I can't explain why the signal from the crank sensor, which goes to the pcm, and then presumably to the bcm (again digitally), is not getting through to the cluster on the pci wire. I am not familiar with the dakota digital approach to adapting the Chevelle sensor output to get it to the pcm/bcm, if that is what you are doing. Maybe that problem is also related to the lack of power sources I listed.
That is about all I can offer.
Roland
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