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  #21  
Old September 8th, 2016, 05:19 PM
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Robert Davis
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Quote:
Originally Posted by Red90 View Post
IME... The power side does not matter. They are designed to work with variable input voltage. The ground side can be an issue because if there is a voltage difference between the gauge ground and the sender ground, it will show up as a change in the reading.
I know this is a 2013 thread, but
Have experience watching the VDO gauge readings change from (+) current draw.
Here was the scenario:
Green circuit connection gauge reads fine.
Turn on the wiper motor, blower motor, and Lucas electrical defroster held to the flat windscreen with suction cups and the gauge reading falls.
Turn the wiper motor, electrical defroster, and blower motor off and the gauge reading goes back up.
Have no idea what the current draw was.
This was on our MGTD with a 45 Amp alternator upgrade compared to the 20 Amp generator.
Converted the original smiths tach to electrical impulses off the alternator upgrade.
It was cold and at night so the lights and driving lights were on as well.
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  #22  
Old September 8th, 2016, 05:44 PM
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John B.
1991 Defender 90, 200TDI
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The changes are from the ground, not the power. I've been through this in great detail with a lot of testing. The supply voltage always changes and that does not affect the readings. The are designed to work for a large range of input voltage.

If you get a slight variation in the grounds, the readings go all over the place. Sharing a ground with a high draw item or having a poor ground between the engine and wherever the gauges ground to, causes the swings as you turn things on and off. All that it take is half a volt variation between grounds and the readings go way off.
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  #23  
Old September 8th, 2016, 06:02 PM
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Robert Davis
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Seems plausible considering the age of the vehicle, but with this particular TD there were separate ground wires run...
BUT
Like all the other connections they were grounded to the bulkhead.
If the ground was weak, then turning on and off a lot of items using the ground would rob and restore the bulkhead of (-) voltage.
Seems like a distinct possibility of suffering from a poor ground connection.

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  #24  
Old September 8th, 2016, 10:37 PM
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Jeff Payne
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Quote:
Originally Posted by st0k3d View Post
What changed that got you the new power? My presumption is that the alternator shouldn't matter once running as it is all mechanical.
I think I was comparing the power output to that of the 2.25 that I pulled out of there.
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