guage question for the really smart electrical guru

[TURNMEOVER]

I understnd the electro magnetic principals on which the guage functions and I also know the ways to modify the emf to alter the resistance in which the coil needs to match a the values of diffrent sending units. But what I cannot figure out is what is this contact for inside the fuel guage. It apears to open and close the pos feed to the engine coolant temp guage. Is this correct and what is its purpose?

 

[TURNMEOVER]

This is the best pic I can give you.

 

[bsmith123]

pic?

where's the pic?
took a look at the 69 schematic and the 12vdc power is common to both, in other words shared. on the other side of the gauges wires go out to the sending units to ground. The sending units will vary the grounds resistance to control the amount of current flow thru the gauges coil

 

[TURNMEOVER]

where's the pic?

I can see it. Can you? The pic is of the back side of the fuel guage removed from the cluster.

 

[Eshu Elegua]

must be a black-white picture,,nothing show up on your post..

 

[cruiserbrett]

It is the "voltage regulator" for the water temp gauge. It ensures that despite charging voltage fluctuations, the temperature gauge reads consistently

 

[Pin_Head]

X2

It is indeed a voltage regulator. Bonus points will be given for explaining how it works.

 

[bsmith123]

voltage stabilizer

it turns the voltage on and off

it works by monitoring the voltage to the gauges and keeping them at about 10 or 11 volts. the gauges are dampened so it shuts the voltage off and on and the gauges dont follow the voltage and stay in range. By keeping in the less than full voltage range it prevents the gauges from cycling up and down


Yes I am on mud at 6 xmas morning---The kids are waiting for their Mom to wake up

still dont see the pic and I am squinting hard!

I think we may need a harder question for really smart electrical guru status though

 

[3doghouse]

It looks like your images are on a login-protected site: Login

 

[cruiserbrett]

IIRC, the contact arm is wrapped with wire, which transmits current when circuit is closed. due to current flow, heat builds up and causes the bi-metaillic spring to change shape, opening contacts. Shortly the spring will cool, closing circuit and restarting cycle. because of the high impedance of the guage and test meters it appears that the output is a close to a steady 7 or so volts, but to a small test light it is actually switching on and off.

points?

X2

It is indeed a voltage regulator. Bonus points will be given for explaining how it works.