Time to install a fan time on the 2000 for the heat soak issue. It has been flaring up a lot lately, even with DEI fuel wrap kit and a LeBaron hood vent. There are many, many write ups, I'm reading through them now, but my wiring knowledge on this is testing me.
I'm wanting to use a similar timer that I have for my dash cams, as I love the timer and its adjustability. https://www.amazon.com/gp/product/B00PD65UGA/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A2C3OEB0RE1BRS
I'd like to hook up the timer to a momentary switch on the dash, that when pushed after I cut off the Jeep will trigger the timer to run the eFan for 3 mins. Here is where my knowledge gets fuzzy, it's been a long time since I went this far with 12v.
I know the PCM uses PWM to activate the stock fan relay with a ground trigger, and any modification not done correctly will set off a CEL, or cook the PCM worst case. I need to add a diode to keep power flow out of the PCM and isolate the new timer circuit. I am just not wrapping my head around the diode size and where to place it.
My plan is to take advantage of as much factory wiring as possible. I would add a new fused relay that is triggered by the timer to run for 3 mins, and wire that in parallel to the original wiring. Where to put the diode, and what size to use?
What size/placement of diodes does everyone suggest, or have used?
I'm wanting to use a similar timer that I have for my dash cams, as I love the timer and its adjustability. https://www.amazon.com/gp/product/B00PD65UGA/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A2C3OEB0RE1BRS
I'd like to hook up the timer to a momentary switch on the dash, that when pushed after I cut off the Jeep will trigger the timer to run the eFan for 3 mins. Here is where my knowledge gets fuzzy, it's been a long time since I went this far with 12v.
I know the PCM uses PWM to activate the stock fan relay with a ground trigger, and any modification not done correctly will set off a CEL, or cook the PCM worst case. I need to add a diode to keep power flow out of the PCM and isolate the new timer circuit. I am just not wrapping my head around the diode size and where to place it.
My plan is to take advantage of as much factory wiring as possible. I would add a new fused relay that is triggered by the timer to run for 3 mins, and wire that in parallel to the original wiring. Where to put the diode, and what size to use?
What size/placement of diodes does everyone suggest, or have used?