The Triumph Dolomite Club - Discussion Forum

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PostPosted: Mon Jun 19, 2017 9:58 am 
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HI FOLKS,
OUT IN MY DOLLY 1850 LAST NIGHT AND WHEN I PUT MY HEADLIGHTS ON THE TEMP GAUGE GOES UP AND VOLTS GO DOWN :?
I HAVE SINCE FOUND THAT EVEN THE HRW OR THE HEATER BLOWER CAUSE THE SAME FAULT.
DOES NOT OVERHEAT AND HAVE CHECKED THE ALT AND IT IS CHARGING PERFECTLY.
IF NO ELECTRICS ARE BEING USED EVERYTHING IS OK.
ANY IDEAS :?:
CHEERS,
TONY.


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PostPosted: Mon Jun 19, 2017 10:49 am 
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Tony

I think you have a bad earth connection,clean the earth connection for the lights,also check the earth wire has not come of the voltage stabilizer

Dave


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PostPosted: Mon Jun 19, 2017 11:42 am 
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Tony

Check the all internal connections there are three connector blocks behind the dash and three at the bottom of the steering column - seem like a poor connection in one of these connectors and I'm going to say the ones at the back of the dashboard.

How's the fuel gauge performing does that alter when the headlights are on - the fuel & temp gauge are require a constant voltage the voltage regulator (next to the fuse box) gives this - if its faulty the fuel gauge and temp will give wrong readings ie 1/2 a tank of fuel, start the car up, registors half a tank then the needle drops back the zero ( no fuel in tank according to the gauge.

Paul

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PostPosted: Tue Jun 20, 2017 5:33 pm 
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HI DAVE AND PAUL,
HAVE CHECKED ALL THE EARTHS AND THE VOLTAGE STABLISER ALL OK :)
WILL NOW HAVE TO REMOVE DASH TO CHECK ALL CONNECTIONS :(
STRANGELY THE FUEL GAUGE IS BEHAVING AS IT SHOULD.
I TOOK THE CAR FOR A RUN TODAY, JUST TO CHECK IT WAS NOT OVERHEATING, AND NOTICED THAT EVEN USING THE INDICATORS OR BRAKE LIGHTS WHEN SAT AT TRAFFIC LIGHTS CAUSED THE SAME PROBLEM :?:
I DID LEAVE THE CAR TICKING OVER WHEN I GOT BACK FOR ABOUT HALF AN HOUR!! AND NO OVER HEATING OR VOLTAGE LOSS. PUT ANYTHING ELSE ON ELECTRICAL AND SAME THING HAPPENS.
ANYTHING ELSE I SHOULD LOOK FOR WHEN I TAKE THE DASH OUT?
MANY THANKS,
TONY.


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PostPosted: Tue Jun 20, 2017 5:55 pm 
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Have you checked the alternator charge at idle with all electrics on, headlights, blower HRW, radio etc. It should still be giving a good charge.

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PostPosted: Tue Jun 20, 2017 7:26 pm 
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Looks like the gauges are earthed by the panel lights. When putting the lights on the earth isn't there anymore and takes a new path.


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PostPosted: Tue Jun 20, 2017 10:01 pm 
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Quote:
Looks like the gauges are earthed by the panel lights. When putting the lights on the earth isn't there anymore and takes a new path.


Jeroen
HI JEROEN, IT DOES IT EVEN IF JUST THE BLOWER IS ON OR THE WIPERS:(
BUT HAVE GOT TO SAY PANEL LIGHTS ARE NOT VERY BRIGHT.
WILL CHECK CHARGING WITH EVERYTHING ON AGAIN, IT WAS OK (14.8 VOLTS) AT 1500RPM, BUT WILL CHECK AGAIN. VERY PUZZLEING WHY FUEL GAUGE IS OK THOUGH :?
CHEERS, TONY.


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PostPosted: Tue Jun 20, 2017 10:07 pm 
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Almost sounds like you have water trapped somewhere, grounding when you use anything.

Have you cleaned out the fuse box and alternator plug.

Before going too far, remove one fuse and see if the problem
changes.

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PostPosted: Thu Jun 22, 2017 12:26 pm 
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There is a common earth point behind the dash IIRC. A bunch of black wires are all crimped together.

But before going there I'd look at the instrument voltage stabiliser and note that it earths out through the casing and mounting screws. Give that a clean and see how you do.

Never a bad thing to clean out the fuse box either.


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PostPosted: Thu Jun 22, 2017 9:12 pm 
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Quote:
VERY PUZZLEING WHY FUEL GAUGE IS OK THOUGH :?
CHEERS, TONY.
Jonners - if the fuel gauge is working fine it cannot be the voltage stabilizer at fault.

Paul

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PostPosted: Thu Jun 22, 2017 10:17 pm 
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It's not something as stupid as the knurled nut loose on the retaining bracket of the temp guage which retains the earth wire as well?

Steve

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