follow up to 1N4007 diode comment. The actual total nomenclature on this forward biased diode inside the rcm module is: 1N4007 -935j where 935 J refers to the unit of energy known as a Joule. 1.0 Joule = 1.602176565 x 10-19 =1.0 electron volt meaning that the diode will fail due to heat dissipation when the electrical flow through the diode exceeds 5.835811 volts dc causing the circuit to fail and preventing the car from cranking and starting. The good news. a 1N4007 forward biased diode can be had for under 10 cents. Here is a link: https://www.mouser.com/_/N-1yzvvqx?K...&No=25&FS=True for the diode and here is a link for the replacement relay: https://www.onlinecomponents.com/ame...10618644.html# . Here is the info on the resistors used on the board as well.