SmthnD1ff Posted January 22, 2014 Share Posted January 22, 2014 I'm in the process of a major rewiring and cleaning up of the engine compartment and am adding an under hood fuse/relay bank from a 2000 cherokee. Can I use the starter relay from the cherokee to engage my starter? Simply put, will the cherokee relay start the truck? I am aware that the comanche relay is wired differently. As I said I am completely rewiring the engine compartment and am moving the fuse box from under the dash and replacing it with the one from the cherokee, relocating it to the passenger side of the engine bay. I have already deleted the C101, added additional grounds to each one of the sensors and run them directly to the ecu and am in the process of connecting the leads to/from the old fuse box to the new one. My reason for wanting to use the cherokees relay are purely cosmetic- I am trying to clean up abd update the tired and over engineered renix harness and connectors, removing anything that isnt used or could cause resistance. Link to comment Share on other sites More sharing options...
Eagle Posted January 22, 2014 Share Posted January 22, 2014 The starter relay is, IMHO, redundant, because the starter is actuated by a solenoid. In "the old days," we only had solenoids. In effect, the current setup is like using a relay to operate a relay to operate a device. Bottom line: A relay is only a switch. ANY relay can send power to a solenoid. You are aware that a 2000 Cherokee doesn't have just the fuse panel under the hood, right? There's a second fuse panel in the passenger side footwell, behind the kick panel. Link to comment Share on other sites More sharing options...
SmthnD1ff Posted January 22, 2014 Author Share Posted January 22, 2014 Thank you! And what I am calling a fuse box is the PDC. I am going to use it as a fuse and relay box Link to comment Share on other sites More sharing options...
Jeep Driver Posted January 23, 2014 Share Posted January 23, 2014 You have two banks of relays at the PDC.....4 standard and 5 minis. If it were me, starting from scratch, I'd use the 4 standards where it counts........I'd wire the head lamps off the starter relay, as already stated....redundant and pointless. The auto shut off will also not be used.........there, maybe off road lights or other. I'd have two looms off the firewall.............power and controls out to PDC, and then power and grounds and sensor info coming in. Link to comment Share on other sites More sharing options...
Eagle Posted January 23, 2014 Share Posted January 23, 2014 I think a relay operating a solenoid is redundant, but I would not advocate eliminating it. There must be a reason why both Jeep's engineers and Chrysler's engineers use a relay. But if the basic functions are going to be transferred from the original Renix 4-relay array to the 2000 PDC, that means you'll have a bank or four relays doing nothing. Those could easily be re-purposed for things like headlights, fog lights, auxiliary lights, etc. Link to comment Share on other sites More sharing options...
SmthnD1ff Posted January 23, 2014 Author Share Posted January 23, 2014 Removed: double post Link to comment Share on other sites More sharing options...
SmthnD1ff Posted January 23, 2014 Author Share Posted January 23, 2014 My plan is to use the 4 of the big relays: Starter, fuel pump, headlights, latched b+ (although I am not sure the function of b+ in the stock renix setup) The 5th mini relay was originally for the ac clutch and will be reused as such in mine, signal lead fed by an in cab switch (stock ac controls and hvac have been removed and replaced with different ones) Link to comment Share on other sites More sharing options...
SmthnD1ff Posted January 23, 2014 Author Share Posted January 23, 2014 As far as the new setup goes- any thoughts? The MJ has the FP relay, Alt, Ign sw, and hard line from battery all posted off the starter relay terminal. I was thinking that I would run the PDC directly to the battery via the big terminal on the front of the PDC, then all power wires (relays, ECU, ign sw, lighting, stereo/amp, blower motor, wipers, gauges) run through seperate relays. The fus link on the pdc to the alternator. Does this sound right? Link to comment Share on other sites More sharing options...
Eagle Posted January 23, 2014 Share Posted January 23, 2014 I would suggest you get a 2000 XJ wiring diagram and check it out. See what goes through relays and what doesn't. If I understand your plan correctly, you intend to retain the Renix setup, and just reroute some wires to/through the updated PDC. I don't think the OEM Renix setup runs the ECU through a relay, and I doubt it draws much current, so why do you want to run it through a relay? Link to comment Share on other sites More sharing options...
SmthnD1ff Posted January 23, 2014 Author Share Posted January 23, 2014 I have the diagram and plan to use the relays for their intended purpose. The fuses are going to be used to replace my existing fuse box. ECU runs directly to battery. Link to comment Share on other sites More sharing options...
Jeep Driver Posted January 24, 2014 Share Posted January 24, 2014 I have the diagram and plan to use the relays for their intended purpose. The fuses are going to be used to replace my existing fuse box. ECU runs directly to battery. Do you have a COMPLETE Renix XJ or MJ to model or use as an example? On mine.....going by memory........Fused link from alt to breaker......Fused link side of breaker to battery........other side of breaker to relay and ECU. IOWs the ECU is protected at the breaker. You cross the posts of the battery with a wrench and you will fry the ECU. Need to study first........then apply. Link to comment Share on other sites More sharing options...
Eagle Posted January 24, 2014 Share Posted January 24, 2014 I have the diagram and plan to use the relays for their intended purpose. The fuses are going to be used to replace my existing fuse box. ECU runs directly to battery. That's not what you wrote above: I was thinking that I would run the PDC directly to the battery via the big terminal on the front of the PDC, then all power wires (relays, ECU, ign sw, lighting, stereo/amp, blower motor, wipers, gauges) run through seperate relays. Link to comment Share on other sites More sharing options...
Eagle Posted January 24, 2014 Share Posted January 24, 2014 I have the diagram and plan to use the relays for their intended purpose. The fuses are going to be used to replace my existing fuse box. ECU runs directly to battery. But most of the fuses in the footwell fuse panel on the MJ are replaced by the fuse panel in the passenger kick panel on the newer XJs, not by the PDC under the hood. Link to comment Share on other sites More sharing options...
SmthnD1ff Posted January 24, 2014 Author Share Posted January 24, 2014 I have the diagram and plan to use the relays for their intended purpose. The fuses are going to be used to replace my existing fuse box. ECU runs directly to battery.But most of the fuses in the footwell fuse panel on the MJ are replaced by the fuse panel in the passenger kick panel on the newer XJs, not by the PDC under the hood. Yeah I misspoke before. I have the fsm and all wiring diagrams- basically I'm just relocating the fuse box to under the hood and replacing it with the pdc Link to comment Share on other sites More sharing options...
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