Tanner Posted August 10, 2016 Share Posted August 10, 2016 Aside from the obvious benefits (i.e. preventing a fire), theoretically, adding a relay would increase the performance of the blower motor would it not? I live in central Florida, daily here the heat index 110 so I run my a/c almost constantly. So a relay is an important next step for me as far as protecting my truck. I'm just curious if anyone has installed a relay and reaped benefits such as air volume. It cools well but the air flow is just poor, it takes 45 minutes to cool the cab down in this heat which is almost the entire length of my commute home haha. when I get in the truck at the end of the day its over 120 degrees in there so it takes some time. Link to comment Share on other sites More sharing options...
Blue88Comanche Posted August 10, 2016 Share Posted August 10, 2016 I feel your pain, iv been pondering the same thing to help distribute the electrical load Link to comment Share on other sites More sharing options...
Tanner Posted August 10, 2016 Author Share Posted August 10, 2016 To me its the only logical step to improve performance shy of trying to find a motor that's from another make that works better but is still compatible (which I doubt exists). even then I would rather not go hacking things up to make one fit. I'm 100% open to any ideas that people have because its just not cuttin' it haha. Link to comment Share on other sites More sharing options...
HOrnbrod Posted August 10, 2016 Share Posted August 10, 2016 The Renix blower motor has a long rambling ground wire on it; all the way to the other side of the engine compartment. A relay on the blower motor hot wire isn't going to help much if at all with a poor ground. Cut off your existing black ground wire near the motor connector, and using a butt splice (or solder & heat shrink), splice it back together including an additional length of 10 - 12 AWG wire. Tie this new wire to a good grounding point on the right fender, or even on the dipstick tube ground cluster. Your blower motor will run faster. It would also be a good idea to pull your blower motor first and check the ducting for any obstructions inside. For the 91s and 92s, the blower motor ground configuration was upgraded by the factory and is satisfactory as-is. Link to comment Share on other sites More sharing options...
cruiser54 Posted August 10, 2016 Share Posted August 10, 2016 Here ya go: http://cruiser54.com/?p=211 Also, how are your main grounds? Ever refresh them and/or add some? Link to comment Share on other sites More sharing options...
Eagle Posted August 10, 2016 Share Posted August 10, 2016 All a relay is is an electronic switch. Inserting a switch into a circuit does not, by itself, enhance the circuit in any way. In fact, it adds another device that can cause current loss. The power to the blower motor goes through a resistor pack under the dashboard. Where in the circuit are you going to place your relay, and do you intend to maintain the multiple speeds offered by the factory setup? I would try Hornbrod's ground enhancement suggestion first. Much simpler. Link to comment Share on other sites More sharing options...
Tanner Posted August 10, 2016 Author Share Posted August 10, 2016 ^^ that is good information to know I will give that a shot. Link to comment Share on other sites More sharing options...
Tanner Posted August 10, 2016 Author Share Posted August 10, 2016 Here ya go: http://cruiser54.com/?p=211 Also, how are your main grounds? Ever refresh them and/or add some? never added any but did the refresh when I put my truck back together Link to comment Share on other sites More sharing options...
cruiser54 Posted August 10, 2016 Share Posted August 10, 2016 Here ya go: http://cruiser54.com/?p=211 Also, how are your main grounds? Ever refresh them and/or add some? never added any but did the refresh when I put my truck back together Well then, I would click the link and upgrade the ground next. Let us know how it is. Link to comment Share on other sites More sharing options...
HOrnbrod Posted August 10, 2016 Share Posted August 10, 2016 Chrysler started using a blower motor relay on the 1997 and up XJs. The relay coil is triggered by ignition-switched 12V and the load contacts are tied to the blower hot lead. Here's how to do it. Wire one in and let us know how it works. :yes: Link to comment Share on other sites More sharing options...
Gene Posted August 10, 2016 Share Posted August 10, 2016 Similar discussion here http://comancheclub.com/topic/49320-relay-on-blower-motor/ Gene Link to comment Share on other sites More sharing options...
Tanner Posted August 11, 2016 Author Share Posted August 11, 2016 awesome guys thanks for the replies, I'm most likely not going to have time to work on it until monday because like I said its my DD so monday is my day off and sunday I'm helping a buddy stick his ax15 back in his TJ. I'll keep you posted on the results. Link to comment Share on other sites More sharing options...
Tanner Posted August 11, 2016 Author Share Posted August 11, 2016 Similar discussion here http://comancheclub.com/topic/49320-relay-on-blower-motor/ Gene Thanks Gene, yeah I actually follow that topic, but after reading through it again I didn't really see any talk of increased performance, so that was more what I was asking just so I know what to expect. Link to comment Share on other sites More sharing options...
Tanner Posted September 6, 2016 Author Share Posted September 6, 2016 Okay so a little late on the update, been pretty busy lately. So two days after this discussion ended my blower motor cut out all together. so I replaced it and it immediately started blowing more to my satisfaction. I then decided I would go ahead and upgrade the ground. It made a noticeable difference. Thanks for the suggestion. I still plan on installing a relay so I'll post again once I've completed that upgrade. As far as safety... will the upgraded ground be sufficient to prevent a fire or should I get on that relay as soon as possible. I just don't want to ruin my investment that I've put so much time and money into. thanks, Jacob. Link to comment Share on other sites More sharing options...
cruiser54 Posted September 6, 2016 Share Posted September 6, 2016 You should be fine with the ground. Thanks for the report back. Link to comment Share on other sites More sharing options...
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