[Radioroslyn]

Or you can use a rough calculation of 10 ma the rf, det, & 1st audio. Measure the voltage @ the right side of 2352. Subtract the voltage you are looking for (100v). This is the voltage you need to drop or get rid of. I use an online calculator to do you work as my brain is mush. https://ohmslawcalculator.com/ohms-law-calculator Voltage = the voltage you want to drop. Current = 10 ma. If you click on the down arrow you can set the current for ma rather than amps. Hit calculate it will tell you the resistance and wattage you need. Always triple the wattage unless you like flaming hot resistors.
Come to think of it since you have a resistor in there you could calculate the current using the voltage drop. This maybe a bit more ecu rate than me guessing...