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  1. I'm totally puzzled. My Comanche is a 1988 and when I turn on the headlights, the tail lights and running lights don't come on, but when I put my foot on the brakes they do come on. Also when I'm towing my trailer, the trailer running lights don't come on unless I put my foot on the brakes. It's not a fuse and I just replaced the switch clearly not the switch. Where is the ground so I can check it next?
  2. Hey y'all. Due to this pandemic I'm out of the job and have loads of time for my comanche project! Hurray! I bought my 87 with a lot of electrical issues and a bad motor. While I sorted out the motor with a used 96 high output, the electrical issues are driving me nuts. Here's my main issue: No turn signals on either side, no illumination on the dash indicators. The hazards do work fine though. I've replaced a few parts and don't know where to go next. It has new turn signal switch (not fun) and a new turn signal fuse, as well as a new negative battery cable. I've yet to
  3. So the 10A fuse for dash lights/running lights/buzzer for having the key in on my 90' Comanche blows when I insert the key. If I put a fresh fuse in and turn the lights on without the key in the dash lights and running lights work, the second I put the key in the fuse pops. So would this mean whatever makes the buzzing noise for leaving the key in is causing this? Or is the ignition bad or what, what should I look for?
  4. Do Wiring Diagrams change for each year? I have a 1988, will the 1987 (70 series) 8980 010 491 work?
  5. I have a 1989 comanche eliminator. Inline 6, 4x4, AX15, 3 inch lift. Been driving fine. Just bought it a couple weeks ago. Has a bit of high idle. Leaks here and there. Smallest amount of coolant in oil but it does have 268k miles. Gonna do the head gasket and such soon. I drove it and parked it, no problem. Blinkers stopped working but was going to look in to that. Been following Cruiser54's tips for sprucing up grounds, adding some, etc. Will keep doing them as i go. The next morning after i parked it in my swamp of a driveway, it wouldnt start. Normally i turn the key and the pump primes, i
  6. I have a new alternator to put into my mj - as soon as the weather warms up a bit. But I need a bit of insight into how the alternator hooks up to the wiring. This could be a stupid question, but here goes: The wiring diagram shows three wires connecting to the alternator. Looks like they go to battery, ignition, and instrument cluster. My jeep only has two wires actually connected at the alternator, battery and (I assume) ignition (since it will start) There is a third wire, but it is not connected to anything at the moment. I have not yet begun to explore the intricacies of t
  7. In adding a decent winch to my beast, I'm looking for advice about my charging system. 1) is there any easy way to tell which alternator (I understand that there were different models with different outputs) is in my truck? 2) What is the largest battery anyone has shoehorned into the normal location? 3) Any recommended battery? 4) If a second battery is added, where does one put it? (Just trying to consider all my options) 5) in wiring the winch, is it preferable to runa ground direct to the battery, is is it ok to ground to the frame? Thanks in a
  8. So I recently bought an 88 2.5L from a guy that had put a lot of effort but no money into keeping it running. Cheap aftermarket guage cluster when sensors would fail. Push button light cause the dash lights would cut out every no and again, local bike cable release cause the hood cable broke. Fiberglass and chip board cause the floor rusted through. All that aside it started and ran alright best I could tell. Replaced the ignition system(starter relay, coil, cap, rotor, plugs, wires) Drove it for about 1000 miles then went after some other repairs. Traded the ax5 from my 89 that is a par
  9. Okay so my problem started when I left my truck sitting for quite some time and when I tried to start it I found my battery was beyond gone, and the cables had corroded extensively. So I bought a new battery and cleaned up the cables quickly and started right up. A week later I try to start it and I got nothing, no crank, no fuel pump sound, and even more interesting no headlights (and yes new battery is good). I know these headlights are separate so I am thinking either multiple fusible links or starter relay? Also I have done Cruiser's ground refreshing tips in the past and also double check
  10. I'm diving into some preventative electrical work in my '88 Pioneer. I've already done the C101 elimenation, and i'll be going through and refreshing ground and haress connections. The other item i would like to include is a replacement of the fusible links with a fuse panel which is fairly simple. The only hangup i'm having is the load ratings for the factory fusible link. I've searched through the wiring manual for the 88 MJ and i cannot locate an amperage rating. One option would be to size the fuses based on the wire gauge for the circuit. This seems a bit risky to me given the al
  11. I've started designing a new chassis wiring harness for my truck; partially in preparation for a tdi swap and partially because I've grown to really like wiring and electrical systems and just want it all fresh. I see there's a green fusible link feeding power to the switch and there's two outputs that feed the "run" position (one also feeds the "acc" position.) By counting the fuse ratings on the circuits fed by these two I come up with 32 amps on the "run only" output and almost 90 amps on the "run and acc" circuit! Am I crazy or is that really high?! The next question would be are these tw
  12. ok guys i need some help on deciding how I'm going to proceed with my swap. i have a 87 Jeep Comanche, I6 2wd 5spd stick. i also have a 96 jeep cherokee I6 4x4 Auto trans. I'm wanting to take these 2 and make my Comanche 4x4 with the auto trans, but I'm not quite sure how to do it. I'm doing this because my cherokee rusting out and has a salvage title and on its last leg, the comanche has perfect body and clean title Option one: lots of work, i swap the whole engine transmission t case and ALL the electronics ( harnesses computers dash ect) out of my cherokee into the comanche. this is all
  13. So when i start my truck, i have to jiggle the key to get the accessories to work (the HVAC, radio and turn signals/wipers) Lately I'm not even able to get them to turn on while jiggling the ignition/key cylinder. I've replaced the cylinder and it still hasn't helped, Any suggestions?
  14. I have an 88 Comanche with instrument cluster problems. The gauge readings are wrong or not reading at all except speedometer of course. I see a Instrument Panel Cluster Relay listed as a possible problem or fix. I can't find the location for the relay voltage regulator. Thanks.
  15. Hello, unfortunately i am posting on here sooner than i intended. Tonight i picked up a 1988 MJ Pioneer, 4.0, 4X4, Manual, 114K Miles. About 50 miles into my 100 mile trip home, cruising along at 65mph, the engine completely died. There was no sputter or signs of charging system issues prior to the issue. I put the clutch in while still rolling and the engine did not crank, or have any sign of life. My headlights and dash lights did stay on the entire time. On the side of the highway i attempted to start the engine multiple times, but nothing moved, no sounds from the starter, solenoid, or
  16. Need Help....I have a 1988 Comanche I've had for about (4) yrs. Truck has been running great, then decided not to start today. Engine will turn over but no start. I've check all battery connections and coil, getting power there but still no fire to the plugs. Distributor cap, rotor, plug wires were changed just a month ago. Any ideas??
  17. Hi I just bought a Comanche that I have been looking for a long time because I wanted to make sure it was the right one. last it was registered was 6 years ago but runs great and was started every couple of months really has been taking care of, although the fuses look fine none of the things are getting power, no wipers, blinkers, tail lights and almost everything that has a fuse for it in the block , the fuses are fine its just like not getting power to all of them. I did see a red wire that was added to the fuse block that was cut and led no where, maybe used for lights or something. Pleas
  18. It has been a long time coming friends. Here is a little background on this project... I drove to Alabama from Georgia to tow this beast home after looking for a long time. Got it for $900 in working condition with some "minor" fixes necessary. I guess "minor" is somewhat subjective, but here is a list of what I got, what was wrong with it, what I've done to fix it so far and what I'm planning on doing. Keep in mind that this is still in progress. I will keep you guys updated as it comes together with tons of pictures and probably some videos. I'm big on videos... Anyway, here's the beast
  19. Hello all! I posted a ways back about a new comanche I was lucky enough to find. Right now there is one extremely daunting task that I am debating turning over to a mechanic, but I wanted to stop by here first to see what you guys thought, because I trust this forum way more than most of the mechanics that would be giving me quotes. For instance, I spoke with one on the phone today that stopped me and said "I already know what the problem is. You don't have to say anything more. You need an entirely new wiring harness and need to re-wire everything. Going to run you about $2,400 and
  20. So, driving home tonight the truck was running great until I was about 3/4 of the way home. Then the truck just randomly died. Lights stayed on, battery connections are solid, no engine code, just dead. Here's the weird thing. After it died, it took about five minutes and then it would start right up. BEFORE that five minutes was up, there was absolutely no power to the starter. No click, no grind, just nothing. My question to you guys is, what the hell could it be? I'm at a loss. I mean, POSSIBLY a ground wire, but then I would think it would kill the battery too and there would be no lights.
  21. Hi All, I have a 1990 Jeep Comanche, 2WD 2.5L 4-Cylinder. Manual AX5 transmission. I've done some minor transmission / clutch work on it with plenty of help and support from the forum. Generally, it runs fine (now). But... Recently it's been doing two strange things: Losing power (shutting off) at low speeds, normally when jarred or bumped. It starts right back up when this happens. Most often, this can be seen when it's parked and I start it, then release the parking brake. When the parking brake jolts, the truck loses power. I have to re-start it. Also, on occasion, it loses power
  22. Please Help, I have a 91 MJ 4L HO with engine electrical issues. I will break it down for ease of ruling stuff out. Engine ran okay when purchased 2 months ago went to restore/build up on it. Tuned up engine New plugs (not platinum, standard plugs) New Wires New Fuel filter New Cap New Rotor Cut Cat Conv out, new 2 and 3/4"exhaust and muffler (not from jeep), Disconnected battery when I welded on new pipes to existing. Engine now idles fine but when put under load (in gear) backfires through throttle body, pukes oil/gas mixture into air box, plugs black, no power, Checked
  23. I'm curious about the proper cleaning of electrical terminals on our MJs. They seem to really gunk up, sludge up, and tar up quite heavily over time. Here in Alaska, a can of electrical parts cleaner costs around 7 bucks, which is far too much to blow through them regularly. So I'm curious if you can use a kerosene pumping parts cleaner to soak/clean out the electricals, then spray off the consequential residue with the electrical parts cleaner. Anyone know if it's safe for the electricals?
  24. Hello all, i bought my 1st comanche yesterday and all of the signals DID work except for the front left.. it would stay on continuously no matter what, aslong as the headlights were on, and the hazard lights wouldnt do anything... now today NONE of the signals work, and the front left still stays completely illuminated aslong as the headlights are on, and the hazards also still don't work, and now i have noticed the interior arrow lights no longer light up and no longer makes the clicking noise when you turn. Ive ripped right into the dash, check all of the relays, fuses appear to be good,
  25. Problem: Brake lights do not work.Need help diagnosing the problem so I can pass vehicle inspection. There may be a few electrical problems, but the critical issue at hand is the brake lights. Truck: 1987 2.5l, AX4 2WD. Symptoms:1) Running lights work. Therefore I assume the ground is good? 2) Turn signals work. They are s..l..o..w.. when the lights are on, normal speed when the lights are off. 3) Turn signal dash lights: When the running lights are on, both signal (little green arrows) are "on" even though the signal is not activated. When the running lights are turned off
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