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3 Posts
Greetings,
I've run into a bit of a snag on an 88 TDub rebuild, and was hoping someone here may be able to steer me in the right direction. I have an 88 TDub that I picked up off of ebay, very rough shape, which I've basically torn apart and rebuilt. I'm to the point of trying to get this thing running but having some trouble getting it started. Compression isn't great (90 PSI cold) but its better than when I bought it and it would start when I got it (which can only mean I've messed "something" up). It does get a very weak spark, and it seems to be getting fuel as well. Every now and then it will 'try' to turn over but, nothing more than a little tease.
So I started going back over the ignition system. Ignition coil (replacement) is within specs on both primary and secondary windings. Pickup coil (green and white wires) is at the high end of spec, but appears ok. The source coil (brown and red wires according to the manual) was WAY out. On the bike, it was reading about 15 Million Ohms. So, I'm thinking probable suspect. However, before I bought a new one I thought I would at least take a look at it to make sure all the connections looked ok....and that's where the question comes in.
I don't see how testing resistance/continuity between the red wire and the brown wire could possibly work....and now I'm wondering if I'm testing the wrong wires.
On the stator, for the ignition circuit there seems to be two coils...a larger one and a smaller one right next to it. My red wire is connected to the larger coil, and the other connection to that coil is a black ground wire that connects to the stator's core. The smaller coil has a brown and yellow wire. However, I don't see how/where there is any continuity between the smaller coil and the larger coil (and thus the brown and red wire) in this configuration....so it would seem impossible for that reading to be within 4-600 Ohms.
I tested the red wire to black wire (as well as to the stator core) and its about 700 Ohms over the larger coil. I tested the brown wire to yellow wire on the smaller coil and it was about 40 ohms. But it is infinite resistance between red/brown or red/yellow. From what I can see, there would have to be some connection to the stator core on the smaller coil for there to be any continuity to the red wire in this configuration....and I don't see anything like that here. Now the harness on this bike was completely butchered....and I wouldn't be surprised if they messed around with the stator as well...because this is just not making any sense to me.
I was hoping someone might be able to confirm the color coding of the wires in regards to what they are connected to on the stator itself, as well as confirm that when testing the source coil, what are you actually testing on the coil itself (for example if what is supposed to be tested is the resistance over the smaller coil....the brown and yellow wires in my particular example....or if you actually are testing resistance between the two coils) I hope that makes sense.
I have pretty much resigned myself to the fact I need a new stator...but after looking at it I'm a little concerned that the color wires listed in the manual (red/brown) don't appear they could possibly be correct on this stator.
Any assistance and/or clarification would be greatly appreciated.
I've run into a bit of a snag on an 88 TDub rebuild, and was hoping someone here may be able to steer me in the right direction. I have an 88 TDub that I picked up off of ebay, very rough shape, which I've basically torn apart and rebuilt. I'm to the point of trying to get this thing running but having some trouble getting it started. Compression isn't great (90 PSI cold) but its better than when I bought it and it would start when I got it (which can only mean I've messed "something" up). It does get a very weak spark, and it seems to be getting fuel as well. Every now and then it will 'try' to turn over but, nothing more than a little tease.
So I started going back over the ignition system. Ignition coil (replacement) is within specs on both primary and secondary windings. Pickup coil (green and white wires) is at the high end of spec, but appears ok. The source coil (brown and red wires according to the manual) was WAY out. On the bike, it was reading about 15 Million Ohms. So, I'm thinking probable suspect. However, before I bought a new one I thought I would at least take a look at it to make sure all the connections looked ok....and that's where the question comes in.
I don't see how testing resistance/continuity between the red wire and the brown wire could possibly work....and now I'm wondering if I'm testing the wrong wires.
On the stator, for the ignition circuit there seems to be two coils...a larger one and a smaller one right next to it. My red wire is connected to the larger coil, and the other connection to that coil is a black ground wire that connects to the stator's core. The smaller coil has a brown and yellow wire. However, I don't see how/where there is any continuity between the smaller coil and the larger coil (and thus the brown and red wire) in this configuration....so it would seem impossible for that reading to be within 4-600 Ohms.
I tested the red wire to black wire (as well as to the stator core) and its about 700 Ohms over the larger coil. I tested the brown wire to yellow wire on the smaller coil and it was about 40 ohms. But it is infinite resistance between red/brown or red/yellow. From what I can see, there would have to be some connection to the stator core on the smaller coil for there to be any continuity to the red wire in this configuration....and I don't see anything like that here. Now the harness on this bike was completely butchered....and I wouldn't be surprised if they messed around with the stator as well...because this is just not making any sense to me.
I was hoping someone might be able to confirm the color coding of the wires in regards to what they are connected to on the stator itself, as well as confirm that when testing the source coil, what are you actually testing on the coil itself (for example if what is supposed to be tested is the resistance over the smaller coil....the brown and yellow wires in my particular example....or if you actually are testing resistance between the two coils) I hope that makes sense.
I have pretty much resigned myself to the fact I need a new stator...but after looking at it I'm a little concerned that the color wires listed in the manual (red/brown) don't appear they could possibly be correct on this stator.
Any assistance and/or clarification would be greatly appreciated.