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#729363 - October 28th 2017 6:50 am Instrument cluster gone bonkers! Ideas?  
Joined: Mar 2015
Posts: 58
Bourneavanner Offline
journeyman
Bourneavanner  Offline
journeyman

Joined: Mar 2015
Posts: 58
London, UK
Hey guys,

I’m wondering if any of you can shed some light on my new issue that popped up today...

Basically all my gauges on my 72 Dodge b200 are suddenly reading all or nothing..ie no level at all or full...

Is this an earthing issue or voltage regulator? Or something else....

While I’m at it...if anyone knows of anyone selling an early to mid 70’s instrument cluster let me know, the magnets are stuffed on my speedo as well...😩

Thanks guys👍🏻

#729380 - October 28th 2017 6:11 pm Re: Instrument cluster gone bonkers! Ideas? [Re: Bourneavanner]  
Joined: Apr 2010
Posts: 2,572
wrcsixeight Offline
veteran
wrcsixeight  Offline
veteran

Joined: Apr 2010
Posts: 2,572
San Diego
Prefacing this reply with I have no idea about that model year, my 89 uses a 5v regulator from the gauges and its technology dates from 1937.

Mine looks like this, and I see the same part back into mopars of the mid 60's

[Linked Image]

[Linked Image]

When my gauges started acting funny, I replaced this gizmo, with a more modern version.

https://www.amazon.com/DROK-Waterpr...mp;psc=1&refRID=P1NZ1K3KE5PYWKWQJNW5

This one's voltage is adjustable and has been powering my gauges for about 3 years IIRC.

Also check that the ground wire for the instrument cluster is actually well grounded. Mine is grounded to the dashboard, and the dashboard's mounting screws might not have very good contact with The body/frame anymore. And of course the main battery to frame ground is usually an issue at some point too.

the pins' on the clusters primitive circuit board are also known to develop fractured solder joints which can cause your wacked out gauges. Reflowing the solder on them is pretty simple and could be effective even if it passes a visual inspection of them.

No idea about the speedo. Reed seems to have a good grasp on their functioning internal doodads

Last edited by wrcsixeight; October 28th 2017 6:25 pm.
#729392 - October 29th 2017 4:45 am Re: Instrument cluster gone bonkers! Ideas? [Re: wrcsixeight]  
Joined: Mar 2015
Posts: 58
Bourneavanner Offline
journeyman
Bourneavanner  Offline
journeyman

Joined: Mar 2015
Posts: 58
London, UK
Great! Thanks for the info. I’ll start with the regulator and see how I go👍🏻

#729406 - October 29th 2017 2:10 pm Re: Instrument cluster gone bonkers! Ideas? [Re: Bourneavanner]  
Joined: Apr 2010
Posts: 2,572
wrcsixeight Offline
veteran
wrcsixeight  Offline
veteran

Joined: Apr 2010
Posts: 2,572
San Diego
One needs an analog voltmeter to check the ancient voltage regulator's output.

Since the circuit board has to come out anyway, I would reflow the solder on the connector pins at that time too.

#729409 - October 29th 2017 4:16 pm Re: Instrument cluster gone bonkers! Ideas? [Re: Bourneavanner]  
Joined: Mar 2016
Posts: 238
Hasan Ben Sobar Offline
enthusiast
Hasan Ben Sobar  Offline
enthusiast

Joined: Mar 2016
Posts: 238
Tucson,Az.
Stupid electrical problems are ground issues 99% of the time.


Tucson-it's a dry heat...like an oven

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