31-08-2023, 06:14 PM
(This post was last modified: 31-08-2023, 06:15 PM by John Cornforth.)
Hi
The shunt coil for a CFR2 should have a resistance of 33 to 39 ohms. Other 6V cutouts will be similar.
I suggest you measure yours with an ohmmeter between the +D and Earth terminals.
Add an equal value resistor between the cutout earth and the car earth and it will now pull-in at 13 +/- 0.4 volts rather than 6.5 +/- 0.2 volts.
You might need a couple of resistors in series to get the right value, e.g. a 33 ohm plus a 3.3 ohm to get 36.3 ohms.
The higher the value, the higher the pull-in voltage
The resistor will dissipate just over a watt, so a wirewound type rated at 2 watts or more will suit.
The shunt coil for a CFR2 should have a resistance of 33 to 39 ohms. Other 6V cutouts will be similar.
I suggest you measure yours with an ohmmeter between the +D and Earth terminals.
Add an equal value resistor between the cutout earth and the car earth and it will now pull-in at 13 +/- 0.4 volts rather than 6.5 +/- 0.2 volts.
You might need a couple of resistors in series to get the right value, e.g. a 33 ohm plus a 3.3 ohm to get 36.3 ohms.
The higher the value, the higher the pull-in voltage
The resistor will dissipate just over a watt, so a wirewound type rated at 2 watts or more will suit.