My YJ has been running great. I have a howell kit.
So I swapped out the battery, and now nothing. It wont even crank over. I thought maybe I got a bum battery, so I put the one that I just took out, still nothing. No crank, nothing. When I ACC the key, I hear the fuel pump prime like usual, but continue turning and nada.... I checked fuses at mini howell fuse box and they are all good.
Sounds like a bad starter solenoid or high resistance in your positive cable. Make sure both positive and negative connections to the battery are clean. If not use some water and baking soda to clean them. Also do a visual inspection on both positive and negative cables. If either one has any bubbles in the insulation replace it. If all that checks out "good" I would guess starter solenoid. The only way to be sure what's causing your "no crank" complaint would involve a volt meter and a few simple volt drops.
Sounds simple but I bet your connections are dirty, corroded or aren't making a clean connection, my 91 did the same thing. Clean, scrub, sand, etc ALL your grounds and wires on the battery to the starter, ground, and all that. Trust me, they're finicky. Should be a real simple fix if all you did was switch batteries.
If not, you've got the pos and neg cables switched or some ****. Good luck, don't get shocked cause it sucks and keep us posted.
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The first volt drop you should do is from the center of the positive battery post to the cables connector that is on the post. It should read really low like 0 volts or in the milli volts witch looks like mV on a digital volt meter. Anything higher than that you have a bad connection. Then you should do the same thing on your negative side and the same rules apply.
Like RedRockRed said the relay is another easy place to look. easiest way to check it is use your voltmeter and check from the small wire on your solenoid to ground and turn the key. It should read really close to battery voltage. If its bad it will read 0 volts.
I did the starter solenoid, touching posts trick and it fires right up. So that leads me to one of two things, starter solenoid or ignition switch. So buy new solenoid and switch (just in case).
I start w/ solenoid. I took off and swapped one bolt at a time, so I wouldn't miss or put stuff on the wrong bolt.
I got the solenoid put back together, go to fire it up and it trying to fire but sounds like the starter keeps wanting to engage. So I am thinking that the two wires on the top of my solenoid are crossed or something.
So my long winded question, the two wires on top (ignition,starter), where do they go (to witch post). I've tried different combinations, the only one that does ANYTHING is when they are on the SAME post on the battery side.
I am assuming you have a "Ford style" solenoid mounted on the firewall. There should be 3 wires going to the solenoid. One big wire coming from the battery. One big wire going out to the starter. Then a small wire, which is the trigger, coming indirectly from the key by way of some kind of starter relay.
Unhook the small wire. Run a small wire directly from the battery and touch it to where you just unhooked the small wire. Does this make the starter crank?
If yes, then the problem is between the solenoid and the key.
Get a wiring diagram for the starter relay and a test light. Figure out which wire is the one coming from the key and use the test light to see if it is getting power when the key is cranked.
If yes, then the starter relay is bad, replace it. If no, then either keep working your way back toward the starter key or rewire it with a manual starter button.
BTW, did you check the fuses in the regular fuse box inside the vehicle? If not, do that first.
Thanks for the help all. Since the YJ was sold, I couldnt waste anymore time chasing gremlins. So I took it to the shop. Took them about a half hour to find that it was a faulty wire and loose grounds. Anyway, thanks again for the help.