Looking for a wiring diagram for a 2008ish PT100. Trying to fix many faults in regards to a serial cobbler. Currently having intermittent issues with the machine not starting. Key on, fuel pump works, glow plugs cycle but no starter operation. Checked all connections and battery voltage. Can use a remote button to jump the starter battery lead to solenoid and it fires right up. Tested continuity from starter relay to solenoid and key switch wire to relay and starter fuse. All good there. Cleaned the cannon connector, no change there. A diagram would help tremendously. Thank you
If PT is anything like ASV, a lot of your interlock functions, like lap bar, seat belt switch or occupant switch, are wired in series to provide ground for safety relay, which may or may not also be your ground side of starter cranking relay. If you've proved out load side of relay, then your problem could be control side, that being ground, or 12v on terminal 30. Is there a cab connector on that machine, they are prone to corrosion. Check main ground cable at frame attach point.
I've owned a RC100 in the past and am aware of the cannon connector. I've cleaned and re greased the contacts previously. Lap bar and door switchs are removed and bypassed. Seat switch works flawless. Weird thing is the intermittent nature. Sometimes you can cycle the ignition several times and it will fire up. I'm leaning on the ignition switch or starter at this time. Got a new starter on order to replace the Chinese junk and have a spare ignition switch to try. Also been sorting out the switch panel as the machine had a minor light wire fire in there. Going to replace the carling switch terminal blocks on the QA and hydraulic switches. Thanks for the input.
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This is my latest version of one you may see elsewhere that has numerous things being wrong. I have corrected a few things on it but am still finding things that don't seem right but it's the best version I know of so far.
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I am having this exact issue in an RC85, did you figure out what the issue was?
Good question. I couldn't figure it out after working on it for a few weeks. Fortunately I had many spare electrical parts to swap around but unfortunately it still wouldn't start so I used a bypass remote. Oddly enough after being out of state for 4 months, I came back to work on it again and it magically started with the key again. Odd machine electrically.
Thanks for the reply. My machine usually fires right up. today everything else works but the starter. turn key to start and nothing happens. Going to start testing with electrical diagrams. One diagram has the starter solenoid getting powered by the high flow switch which doesnt make sense...
High flow and quick attach are linked to start circuit. Saftey Sally. These machines are highly voltage sensitive. Make sure the quick attach if equipped is in the locked position.
No quick attach on my machine so might be the high flow or safety. It also looks like the key switch only has 3 prongs but like 5 wires? Going to try continuity on that and then the the relays from there. I had done a deep clean and vacuum up in the rear shelf and then was hammering out a slight dent in the cab and then i get a no start. Wondering if i jostled the cable connector in that back corner
ok well turns out it was the relay and i think the big 20amp fuse. Relay was melted a bit and i had mistakenly thought i had tested the fuse for continuity. New relay nothing happened. Then i tested the key switch which was working (continuity between battery and start wires when turned to start). I pulled it out of the console to test. Confirmed it was working with a power probe at the fuse box next. Turning on the key to start sent momentary power to the 86 side so i knew the key was good. Power probed the 87 to send power to it and it started turning the starter so knew that was good. Only thing that wasnt on was 30 on the relay which should be constant power. Traced that back to the fuse, swapped it out and it worked. With the relay out i "hot wired" it by powering on the 87 with a power probe to start the machine. Got in it and all controls worked as normal (lap bar down hydraulics work, lap bar up nothing, etc) so i knew the safety mechanisms were all set. A couple summarized things to check for the relay: 1. If you supply power to the 87 leg and nothing happens, its the starter wire or the starter. That is the direct connection to the starter wire 2. If you are not getting voltage when you turn the key to start on the 86 leg it is something to do with the safety/lockout/ignition. on my RC85 i only have the high/low flow. 3. If you are not getting power to 30 with the ignition on its the fuse. The "hot" side of the fuse is essentially a positive bus bar so everything else "should" also not be working in that row of big fuses. I believe this is the same for the RC100, except the RC100 has a few more things in the lockout side like the quick attach.