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Old 05-15-2015, 09:37 AM   #1
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1996 P32 OBD2 no battery power

I have a 1996 Rexhall Aerbus widebody, P32 chassis, 454 Chevy.
I bought an Ultragauge MX 1.3 and I can't get it to work in my bus. It works in my Dodge pickup just fine.
I have no power to pin 16 on the OBD2 connector.
I checked all of the fuses, they are all ok.
There is one component on the chassis panel that I think is the flasher unit. It has 53 ohms resistance, it is round, and the leads are at 90 degrees to each other.
Any ideas?
Thanks.

woof
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Old 05-15-2015, 01:26 PM   #2
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Does it look like this....BWD S603 - Solenoid | O'Reilly Auto Parts
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Old 05-15-2015, 04:00 PM   #3
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It is a flasher. It looks like this. Forget about this part, why am I not getting power to the OBD2 connector?

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Old 05-15-2015, 04:14 PM   #4
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Is your cigarette lighter aka 12v port working? It is commonly on the same fuse as the OBD2 power. Almost always it is that fuse.
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Old 05-16-2015, 10:37 AM   #5
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My 1996 on a 1995 chassis had an ODB1 not OBD2.
Some people have reported that the ODB2 connector was used on some units in that time frame even though it was connected to a OBD1 bus.
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Old 05-18-2015, 09:40 AM   #6
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Cigarette lighter works.
If it was an OBD1 instead with the OBD2 connector, where is the battery power pin?
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Old 05-18-2015, 09:59 AM   #7
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Quote:
Originally Posted by AUGEDAWG View Post
Cigarette lighter works.
If it was an OBD1 instead with the OBD2 connector, where is the battery power pin?
I don't remember. And now I don't remember where I found out that there were two pins that could be shorted together to read stored fault codes by the number of flashes of the engine light. It might have come from the service manual.
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Old 05-18-2015, 11:47 AM   #8
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Quote:
Originally Posted by AUGEDAWG View Post
Cigarette lighter works.
If it was an OBD1 instead with the OBD2 connector, where is the battery power pin?
Here are two OBD1 plug types and their pin outs.
.:FFS TechNet : OBD1 ECU Pin out Schematics :.
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Old 05-18-2015, 12:17 PM   #9
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It's probably the same as my 96 Itasca Suncruiser. It has a OBDII plug but it still has an OBDI computer. GM called these OBDI 1/2's. I had to take it to a dealer to have him read it. My OBDII reader wouldn't read it ether as there is no 12V to any pin. The dealership reader runs on it's own power. I thought about jumping the pins like you can do with the OBDI but people online say that that can short out your computer and then you'd need to replace it too.
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Old 05-18-2015, 12:32 PM   #10
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Originally Posted by jcgribks View Post
It's probably the same as my 96 Itasca Suncruiser. It has a OBDII plug but it still has an OBDI computer. GM called these OBDI 1/2's. I had to take it to a dealer to have him read it. My OBDII reader wouldn't read it ether as there is no 12V to any pin. The dealership reader runs on it's own power. I thought about jumping the pins like you can do with the OBDI but people online say that that can short out your computer and then you'd need to replace it too.
I jumped the pins several times with no problems. I did use an electronic jumper with small spring loaded pin hooks so shorting to other pins accidentally pins was not an issue.
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Old 05-18-2015, 05:52 PM   #11
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Which system did you jump? OBDI or OBDII? Like I said I have what's called a OBD 1 1/2. OBDI computer but a OBDII plug. We only have (if I remember right) 3 or 4 pins. From what I've read online they say not to jump these 3 or 4 pin OBD 1 1/2 systems. You can jump the OBDI all the time and nothing will happen. Don't know about jumping the OBDII as I have a reader. I'm not going to risk shorting out the computer by jumping it. Dealer read it and didn't charge me nothing.
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Old 05-19-2015, 11:16 AM   #12
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It has been ten years since I had the 1996 P30, but as I recall I had the ODB1 with the OBD2 connector.
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Old 05-19-2015, 02:33 PM   #13
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So if I have a 1996 Rexhall and I want to get parts, do I ask for parts for a 1995?
They made changes from 1995 to 1996 on the 7.4L.
I looked thru all of my owner's manual documentation, which says 1996 P3, and there was no mention of being OBD2 compliant, and no decals anywhere on the vehicle.
This is very confusing.
Vin # 1GBLP37N3T330----
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Old 05-19-2015, 03:16 PM   #14
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It depends on which 7.4L - 454 engine you have. Take my 96 Itasca, I have a 454 w/ TBI (which looks like a carb and has a round air filter) then I look almost everything up for a 95. Now if you have the 454 Vortec engine (which has tuned port runners and a rectangle air filter) then I'd look up everything as being a 96.

I made the mistake when I bought my 96 as thinking hey it's a 96 so it's a vortec engine. Got it home and pulled the doghouse to do a complete tuneup and found out that mine was a TBI engine. I was so made at myself. I wouldn't have bought it if I would have just had them pull the doghouse to see. I think the difference is around 50 HP more for the vortec.
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