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Post by stevew on Jun 21, 2020 15:19:04 GMT
Having a nightmare with the wiring on my 64 smallframe. Its blowing the tail light bulb.
With the engine running I have measured the AC voltage coming from the blue wire and its up at 30V and the Yellow wire is down at 3V ac.
I disconnected the wires at the junction box and I get the same results.
I had a spare unused coil in a box of bits ive had for years so put that in, looks the same as the original and has a blue and yellow lead.
Now with this one wired in and all the stator wiring replaced I'm getting about 8V ac on the blue wire but still only 3v ac on the yellow.
Any ideas, this is doing my head in?
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Post by rowdyc on Jun 23, 2020 2:25:27 GMT
Add a 6 volt regulator to even out the stator output.
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Post by jbcollier on Jun 23, 2020 4:23:31 GMT
Where are you measuring the voltages? With everything hooked up?
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Post by stevew on Jun 30, 2020 18:17:45 GMT
Where are you measuring the voltages? With everything hooked up? Tried with everything hooked up, everything disconnected, still no joy.
Have measured the resistance on the stator coil with it disconnected, the resistance between the yellow and blue wires is only 1.5 Ohms. I would have thought that is too low.
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Post by jbcollier on Jul 1, 2020 14:32:33 GMT
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Post by jbcollier on Jul 1, 2020 14:37:40 GMT
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Post by jbcollier on Jul 1, 2020 14:46:15 GMT
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Post by jbcollier on Jul 1, 2020 15:00:58 GMT
Ok, I have posted three "representative" wiring diagrams to help us walk through your issues. The first one shows the schematics of the actual stator coils. The upper RH coil is the one we're dealing with. The second shows pictorial representations of the electrics which can make it easier to understand what is what. The last is in colour which is much easier to trace than the top two.
First, there is no ground at the coil. Each side provides power to different items but the ground is provided by the other side.
Second, there is no regulator. Voltage is controlled by the load. High voltage means not enough load.
Third, the "blue" side feeds the brake light.
Fourth, the yellow side feeds the taillight, pilot light, headlight and, if equipped, the speedo light.
Fifth, notice each diagram lists specific bulb wattages.
Your problem is that the voltage is too high and the taillight bulb keeps blowing. If the voltage is too high, that means there is not enough load. The usual cause is that one of the bulbs is blown, or the wrong wattage is fitted. Check ALL your bulbs. make sure they work, and that they are the correct wattage. Don't forget the speedo light if you have one.
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Post by stevew on Jul 4, 2020 11:07:46 GMT
Thanks for the diagrams, I only had the basic wiring diagram before. Since my last post, i have ripped the entire wiring loom out. Glad I did as it was full of bodges, bare wires twisted together etc.
Made my own loom, brake light and horn work, I think the individual stator coil that I fitted wasn't the correct one so if it ever stops raining I'm going to fit the original blue / yellow wire coil back into the stator.
I will let you know what happens.
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