Dash voltage reg / temp gauge question

andyrob · Post by **andyrob** » Wed Jan 25, 12 9:05 pm

Temp gauge not working on my roadrunner & petrol gauge always reads lower than it really should.

Have continuity checked the voilet temp wire from the clocks to the temp sensor, fine & tired earthing the wire but no movement on the gauge.
circuit board on clocks looks really good with no cracks etc

Now the dumb Questions..................

So am I right in thinking it is probably the voltage regulator ?
Is the voltage reg the 2 parts on this photo with the arrows to it ?
Can I test it ?
Who's the best to get one from ?

Anything else I can do ? or could it be the gauge itself ?

Adrian Worman · Post by **Adrian Worman** » Wed Jan 25, 12 9:15 pm

Bin it and build an electronic one from parts out of Maplins for a fiver and get a constant 5 volts to the gauges without any fluctuations.
Plenty of info on it on the Challenger Messageboard, ask yer Daveman for a link I can't do it from this poxy phone

sublimemike · Post by **sublimemike** » Wed Jan 25, 12 9:23 pm

Sounds like it firstly - from experience I had - yes that is the voltage regulator your arrows are pointing to. You probably can test it - One of the Daves or someone with more knowledge than me will point you in the right direction if you can use a mutiimeter. If replacement is required dashworks in the states do an upgraded one for $55 if you can't find one here or want an upgrade .

John · Post by **John** » Wed Jan 25, 12 10:22 pm

I bought a solid state one as recommended by Blue but never used it. Think it was around £35 delivered from the states.

MrNorm · Post by **MrNorm** » Wed Jan 25, 12 10:35 pm

http://www.allpar.com/history/mopar/electrical2.html

Dave-R · Post by **Dave-R** » Wed Jan 25, 12 11:08 pm

Yes they are easy to make. You need to check the voltage from it with a meter first to make sure that is where the problem is. Then i can pop into Maplins one lunchtime for you if you like.

ANTON · Post by **ANTON** » Thu Jan 26, 12 8:11 am

Here is the link so you can make one.
I have all the parts as I'm planning on make 10 or more and selling them to club members so if you need the parts quick let me know.

http://www.allpar.com/history/mopar/electrical2.html

Adrian Worman · Post by **Adrian Worman** » Thu Jan 26, 12 9:35 am

That's a good idea and I don't know why anybody ain't thought to make a batch before. Takes minutes to make and cost next to nothing comared to those custom modified units and they work.
Made one for me Chally in a dinnertime inc install, piece of Bananarama!

andyrob · Post by **andyrob** » Thu Jan 26, 12 11:59 am

cheers lads for all the info, am going to do the conversion highlighted by Mr Norm & Anton, very well explianed on that link, the voltage is fluctuating from 2-4 volts, but think its the temp gauge itself that is u/s

Anybody got a working 68-70 non rallye dash temp gauge ??

andyrob · Post by **andyrob** » Tue Jan 31, 12 7:23 pm

did a quick hnd in electronics then this conversion as per the excellent link above, Adrian (top man thanks again) gave me a temp guage out of a van, with a different face but the same mechanism behind, so carfully drilled out the tiny rivets & swapped the facia over, tried it but could not get enough temp in car idling in tonight's northern condition's so shorted temp gauge to earth & flicked ingnition on & bingo temp gauge started to move

Cheers for everyones help

& thanks to this club its fixed.

Also I now have joined facebook as per other thread & posted this question & got 'whats a plymouth roadrunner'

'Ive got a saxo

just need to pass my test once I get off the dole'

andyrob · Post by **andyrob** » Sat Oct 25, 14 12:57 pm

holy thread rivival...........
just so I can find it again
did this to my roadrunner now doing it to my charger

GranSport · Post by **GranSport** » Wed Nov 19, 14 11:28 pm

All 3 dash gauges on Charger fried.
Old regulator pushing out 12 volts

3 new gauges + Built an electronic one and fitted into gutted old regulator.

Coming home yesterday hit the same problem- 3 gauges way off to the right. Stopped car quickly and pulled wires to all 3 sender units.
Back home checked the electronic regulator- 12 volts at both terminals
Opened it up. No shorts, just 12 volts at the 5 volt terminal.

Did it burn out and short to the input voltage?
Could a voltage of amperage spike cause it to fail?
Before it failed I blipped the throttle on start up and the amp gauge was 30-40 amps.
Bit stumped and can't afford to risk the gauges again.

Cheers
Eddie

ANTON · Post by **ANTON** » Thu Nov 20, 14 7:54 am

In Andyrob picture I cant see the capacitor to protect the chip against voltage spikes and that could be you problem.
See the original article on how to build one and they use a capacitor to protect the chip. The one I made has been on my car for three years now.

Demon James · Post by **Demon James** » Fri Nov 21, 14 10:46 pm

The cap's pointing straight at us Anton, just by the ground track at the left green wire

Derek · Post by **Derek** » Fri Nov 21, 14 11:03 pm

Demon James wrote:The cap's pointing straight at us Anton, just by the ground track at the left green wire

I had to look 3 times before I saw it, I must need stronger glasses.

Mopar Muscle Association UK

Dash voltage reg / temp gauge question

Dash voltage reg / temp gauge question

Electronic dash regulator- can they burn out?