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Ampere sending unit
Ken Murphy:
I am looking for a Dc ampere sending unit a 1990 marquis any help would be appreciated Thanks Ken Murphy
Gerald Farris:
Ken,
I am not sure what you mean by ampere sending unit. If it is part of the instrumentation above the driver, we will need to wait for one of the early Marquis owners to answer, or you can call Beaver Coach Sales in Bend. However, if you are referring to the dash gauges, I think that they are standard VDO gauges that are available from any VDO distributor.
Gerald
Ken Murphy:
Gerald,
It is for the panel above the driver’s area. It is a small box with a coil on it that the battery cable runs thru to show ampere draw for the coach. It is located in the rear engine compartment under the remote start panel. Thanks for the response
Edward Buker:
Murph,
Usually the DC current measurement is made by looking at the voltage drop across a shunt resister that will handle high current. The value of the resister very low and is fixed. The measurement circuitry is calibrated such that the small voltage drop that is measered is translated to read out as DC Amps. There are some shunt examples if you try this link. You may be able to find some markings on the shunt like .1 ohms. The parts guys at Beaver Coach Sales may know what the part is and possibly help you find one. Hope this helps.
http://www.rc-electronics-usa.com/current-shunt.html
Later Ed
Ken Murphy:
Ed,
The panel works by voltage the unit has three wires the red white and black. The black is a chassis ground the red is an input and the white is the output. The panel sends 8 volts to the unit thru the red and voltage is returned thru the white. At 0 amps the voltage on the white wire is 4 volts. If the output voltage is higher on the white wire and the panel will read a + ampere value if voltage is lower then 4 volts and the panel read a - ampere value. I am out of town now when I get home Monday I will post a picture of the unit. Thanks
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