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1979 dodge b200 instrument panel circuit board question #732631
February 03rd 2018 8:19 pm
February 03rd 2018 8:19 pm
Joined: Feb 2018
Posts: 31
California
oldpar Offline OP
newbie
oldpar  Offline OP
newbie
Joined: Feb 2018
Posts: 31
California
My instrument panel never did seem to work right.
the ammeter never seemed to register any movement.
The oil light never came on ( I added an oil pressure guage years ago).
Fuel guage never seemed to read correctly.
Lately speedometer started to pin whenever I went over 70MPH
So I decided to tear it open and resolve all this.

New speedo cable turns out to be wrong one. ordered 1979 to 1984. Looks like from pics I have seen 1985 or later.

circuit board looked as though it had been repaired......New circuit boards (both)

new voltage limiter (solid state)

My question is:
When assembling new circuit board there is a lug at one end near one of the IP lights.
Is this a ground lug ? no wires were attached to it but there is a connector nearby that looks as though it would fit (doesn't quite reach) but that may be the instrument panel could have been changed.
Pics attached :

Attached Files IMAG1207.jpgIMAG1208.jpg

1979 Dodge B200 wrangler factory authorized van conversion.
360 cid 727 auto trans NP203 full time 4 wd
AdSense long
Re: 1979 dodge b200 instrument panel circuit board question [Re: oldpar] #732634
February 03rd 2018 8:56 pm
February 03rd 2018 8:56 pm
Joined: Aug 2001
Posts: 11,689
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
Maniac
Joined: Aug 2001
Posts: 11,689
Fircrest, WA
Originally Posted by oldpar
My instrument panel never did seem to work right.
the ammeter never seemed to register any movement.


That might be normal if you never put a large load on the alternator. If the alternator was putting out enough energy to keep the battery charged then the ammeter on the dasy would move very little, if at all.

Originally Posted by oldpar
The oil light never came on ( I added an oil pressure guage years ago).


This is a good thing. I ideal circumstances the oil light only comes on when you first turn the key on. As soon as the motor starts it should build enough pressure to turn the light of.

Originally Posted by oldpar
Fuel guage never seemed to read correctly.


Not overly surprising. Clean the grounds, you already replaced the circuit board voltage regulator, last step is to get ohm readings of the sending unit at various float levels.

Originally Posted by oldpar
Lately speedometer started to pin whenever I went over 70MPH


Sounds like you need to rebuild the speedometer head.

Originally Posted by oldpar
So I decided to tear it open and resolve all this.

New speedo cable turns out to be wrong one. ordered 1979 to 1984. Looks like from pics I have seen 1985 or later.

circuit board looked as though it had been repaired......New circuit boards (both)

new voltage limiter (solid state)

My question is:
When assembling new circuit board there is a lug at one end near one of the IP lights.
Is this a ground lug ? no wires were attached to it but there is a connector nearby that looks as though it would fit (doesn't quite reach) but that may be the instrument panel could have been changed.
Pics attached :


Your pictures are too small and of too low of resolution to let me see what you are referring to. Try posting bigger pictures.

If memory serves, there is one large plug that goes to the circuit board by the speedometer and a separate smaller plug for the oil pressure and battery gauges. i do not recall any separate large lug or plug on the 79-87(?) instrument cluster circuit board.


Windows- they're what make a van worth owning!
Re: 1979 dodge b200 instrument panel circuit board question [Re: Reed] #732635
February 03rd 2018 9:17 pm
February 03rd 2018 9:17 pm
Joined: Feb 2018
Posts: 31
California
oldpar Offline OP
newbie
oldpar  Offline OP
newbie
Joined: Feb 2018
Posts: 31
California
Originally Posted by Reed
Originally Posted by oldpar
My instrument panel never did seem to work right.
the ammeter never seemed to register any movement.


Thank you for the Quick response !!
I will try larger photos.

That might be normal if you never put a large load on the alternator. If the alternator was putting out enough energy to keep the battery charged then the ammeter on the dasy would move very little, if at all.

Even with low battery and I know charging heavily No guage movement.

Originally Posted by oldpar
The oil light never came on ( I added an oil pressure guage years ago).


This is a good thing. I ideal circumstances the oil light only comes on when you first turn the key on. As soon as the motor starts it should build enough pressure to turn the light of.

Even with low oil pressure the oil pressure gauge has shown still no light.

Originally Posted by oldpar
Fuel guage never seemed to read correctly.


Not overly surprising. Clean the grounds, you already replaced the circuit board voltage regulator, last step is to get ohm readings of the sending unit at various float levels.

New grounds, new fuel sending unit. still flaky, this and new speedo actin is what prompted me to look at instrument panel.
Originally Posted by oldpar
Lately speedometer started to pin whenever I went over 70MPH


Sounds like you need to rebuild the speedometer head.

I hope not, But have a suspicion you are correct. This is a new problem. I thought to try the easiest thing first.

Originally Posted by oldpar
So I decided to tear it open and resolve all this.

New speedo cable turns out to be wrong one. ordered 1979 to 1984. Looks like from pics I have seen 1985 or later.

circuit board looked as though it had been repaired......New circuit boards (both)

new voltage limiter (solid state)

My question is:
When assembling new circuit board there is a lug at one end near one of the IP lights.
Is this a ground lug ? no wires were attached to it but there is a connector nearby that looks as though it would fit (doesn't quite reach) but that may be the instrument panel could have been changed.
Pics attached :


Your pictures are too small and of too low of resolution to let me see what you are referring to. Try posting bigger pictures.

If memory serves, there is one large plug that goes to the circuit board by the speedometer and a separate smaller plug for the oil pressure and battery gauges. i do not recall any separate large lug or plug on the 79-87(?) instrument cluster circuit board.



1979 Dodge B200 wrangler factory authorized van conversion.
360 cid 727 auto trans NP203 full time 4 wd
Re: 1979 dodge b200 instrument panel circuit board question [Re: oldpar] #732637
February 03rd 2018 9:32 pm
February 03rd 2018 9:32 pm
Joined: Feb 2018
Posts: 31
California
oldpar Offline OP
newbie
oldpar  Offline OP
newbie
Joined: Feb 2018
Posts: 31
California
New photos attached

Attached Files IMAG1207.jpgIMAG1208.jpg
Last edited by oldpar; February 03rd 2018 9:32 pm.

1979 Dodge B200 wrangler factory authorized van conversion.
360 cid 727 auto trans NP203 full time 4 wd
Re: 1979 dodge b200 instrument panel circuit board question [Re: oldpar] #732695
February 04th 2018 7:14 pm
February 04th 2018 7:14 pm
Joined: Feb 2018
Posts: 31
California
oldpar Offline OP
newbie
oldpar  Offline OP
newbie
Joined: Feb 2018
Posts: 31
California
checked things with ohm meter today.
The black plug not a ground.
The board gets ground from pin A on round plug, I guess the lug is just extraneous.

Last edited by oldpar; February 04th 2018 7:15 pm.

1979 Dodge B200 wrangler factory authorized van conversion.
360 cid 727 auto trans NP203 full time 4 wd
Re: 1979 dodge b200 instrument panel circuit board question [Re: oldpar] #732805
February 07th 2018 12:24 am
February 07th 2018 12:24 am
Joined: Feb 2018
Posts: 31
California
oldpar Offline OP
newbie
oldpar  Offline OP
newbie
Joined: Feb 2018
Posts: 31
California
I put the instrument panel together today, just ignoring the lug.
All the gauges worked including the ammeter and fuel gauge seems accurate.
I have a 36 gal tank that was reading 1/4 after re installing the new boards so figured if i put in 9 gals I should read 1/2 tank.
Sure enough 1/2 tank right on the money. My temp gauge reads dead center normal it had been reding low up to this point.
The oil warning lamp lit until I started it then went out just like it should.

I don't know if the new board or new voltage limiter fixed it. but it is all good now !


1979 Dodge B200 wrangler factory authorized van conversion.
360 cid 727 auto trans NP203 full time 4 wd

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