[TR] Query

[stagbytriumph at triumphstagclub.org]

David,

Ground is ground regardless of the voltage.  Consider your house.  It has possibly 480VAC 3 phase,
or 220/240VAC two phase and then each leg of that makes 120VAC and all that goes to a single ground
point.  Having different grounds for different voltages causes problems on the same machine.

For maintaining power for the instruments, first verify that they actually operate on 6.25VDC or if
there might be a bimetal regulator for a constant 5 vdc which is possible. 

Next you should look for a 12 DCV to 6 DCV voltage "regulator", rated at couple of amps DC and input
/ outputs protected by properly sized fuses, not a "transformer".  Transformers are typically for
Alternating current, and voltage dropping power resistors are used to reduce DC volts to ~6 volts to
power the instruments.  The problem with voltage dropping resistors is that they create heat if
there is any load so locating it is sensitive so you don't burn up anything, and they consume power
on anything that is unswitched.  A power converter will work far better.

For everything else like lights, ignition components, starter, generator to an alternator, make sure
your wiring is properly sized so it can handle the amps needed for your new stuff.

Glenn aka StagByTriumph Garage

-----Original Message-----
From: Triumphs <triumphs-bounces at autox.team.net> On Behalf Of David Porter
Sent: Sunday, August 28, 2022 5:38 AM
To: triumphs at autox.team.net
Subject: [TR] Query

I'm converting a Jeepster from 6 to 12 volt.. the instruments are bimetal and certainly won't
tolerate 12 volts. I have a step down transformer for them. My question/concern is can different
voltages share a common ground? Dave P
** triumphs at autox.team.net **

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