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SportTrac Discussion
Projects
Truck goes crazy when key is out of the ignition, Instrument cluster goes on and off, beeps, ...but I don't think it's the actual instrument cluster.
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<blockquote data-quote="Evox" data-source="post: 1041586" data-attributes="member: 74754"><p>Thank you for your advice. I'm wide open at this point. </p><p></p><p>I do not think this is the cold joint solder problem in the cluster itself. I've had that before, and this ain't it. When my old cluster failed, the symptoms were completely different.</p><p></p><p>I believe it's a short somewhere else. Somewhere between the ignition switch and the PCM that shorts and energizes the PCM, which in turn energizes the cluster, runs its diagnostic, throws codes for every sensor in the truck because the truck is off and the PCM thinks it's on.</p><p></p><p>When the codes are cleared and the truck started ...no codes. The truck runs fine and no electrical problems. When my old cluster went out, the weird electrical problems occurred when the truck was on.</p><p></p><p>In this case, when it sat off for a few seconds, something energizes the PCM and the various relays in the fuse and relay box in the engine compartment.</p><p></p><p>I agree with you. I guess it could be moisture somewhere that caused the short, or it could be a partially broken wire that shorts under certain circumstances. The hot, dry weather might have dried up the moisture. Or moving the truck to the garage moved the wire and broke the short. That or the tech moved the right wire and eliminated the ground. ...I've no idea. <em>I'm out of ideas.</em> I hate electrical problems. Especially intermittent shorts because <em><strong>they're intermittent</strong></em>. Unless you pull the right fuse while the circuit is shorted, you won't find it.</p><p></p><p>I'm going to open the ignition switch again and inspect the wires and plug again. I've already ordered a new key cylinder.</p></blockquote><p></p>
[QUOTE="Evox, post: 1041586, member: 74754"] Thank you for your advice. I'm wide open at this point. I do not think this is the cold joint solder problem in the cluster itself. I've had that before, and this ain't it. When my old cluster failed, the symptoms were completely different. I believe it's a short somewhere else. Somewhere between the ignition switch and the PCM that shorts and energizes the PCM, which in turn energizes the cluster, runs its diagnostic, throws codes for every sensor in the truck because the truck is off and the PCM thinks it's on. When the codes are cleared and the truck started ...no codes. The truck runs fine and no electrical problems. When my old cluster went out, the weird electrical problems occurred when the truck was on. In this case, when it sat off for a few seconds, something energizes the PCM and the various relays in the fuse and relay box in the engine compartment. I agree with you. I guess it could be moisture somewhere that caused the short, or it could be a partially broken wire that shorts under certain circumstances. The hot, dry weather might have dried up the moisture. Or moving the truck to the garage moved the wire and broke the short. That or the tech moved the right wire and eliminated the ground. ...I've no idea. [I]I'm out of ideas.[/I] I hate electrical problems. Especially intermittent shorts because [I][B]they're intermittent[/B][/I]. Unless you pull the right fuse while the circuit is shorted, you won't find it. I'm going to open the ignition switch again and inspect the wires and plug again. I've already ordered a new key cylinder. [/QUOTE]
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SportTrac Discussion
Projects
Truck goes crazy when key is out of the ignition, Instrument cluster goes on and off, beeps, ...but I don't think it's the actual instrument cluster.
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