I bought some 12 volt 30 amp Automotive relay for controlling large 12 volt loads.
Here is the circuit setup along with the relays information. The issue now is that sometime (about 40% of the time) the relay seems to short out because the voltage across the coil drops to 4 volts. The resistors do protect from a full short (I tested it without the resistors the short was about 3.5 amps) I checked about 15 times for a wire shorting and can’t find anything. My only guess is that the diode is shorting or breaking down. It is the correct polarity since the relay does function normally sometimes. I added the diode to prevent flyback from the relay could the diode be to small? I am using a
Coil voltage: 12 volts
Pull-in voltage 6 volts
coil resistance 66 ohms
nominal current 160mA
drop-out voltage 3.6 volts
Thank you, your help is appreciated.