Another dead trailblazer 251NT
I have messaged Duaneb55 about this yesterday after seeing his responses on other forums during a 5 hour google search that was driving me crazy but I will post it here with pictures for the hive mind....
To start.....I am not an electrician....at all......I can rewire a hotrod in my sleep but when it comes to diodes, capacitors and circuit boards I get lost fast but can figure it out with help.
Trailblazer 251 NT
Serial # KK095758
Stock # 903567
This machine was bought new by my old work and I think they had a new board put in it at one point. The board still looks brand new with no burn marks or blown capacitors. The 3 LED lights come on when the engine/starter is cranking but not while it is running.
It has been repowered recently with a Honda GX630 and was working just fine after the engine swap and during testing with the new engine. Now all of the sudden there is zero power on the generator end (AC or DC). So far I have cleaned the slip rings (learned about those today from Duane's answer on another forum) and tested the ohms between each (also by Duane's instructions), checked all fuses (all good), checked for any loose or sparking wires and found none and put a test light and meter on literally any exposed lug, connector or electrical looking doodad I can see on the generator end and have found nothing except at the back of the on/off switch.
I have the diagram that came in the manual and on the inside of the side cover but with my limited knowledge of this type of electronics I am trying to make sense of it.
If the slipring closest to the bearing is #1 the ohm readings I got were....
between 1 and 2 = 30.0
between 2 and 3 = 3.0
between 1 and 3 = 32.6
No power at the center ring or any brushes while engine is running.
All three brushed seem good with no stuck springs.
I have no idea what these readings mean but I saw Duane ask for them in other forums.
The only thing I saw that struck me as weird was the long capacitor that is clamped down under the board with the LED's looks like it has a bunch of dimples in it but they seem to uniform to not be made during production....maybe?
It has never been jump started and has a newer battery.
Could the 3 LED's coming on only when the starter is cranking be an indication that we wired the start circuit wrong on the new engine? I don't know when or why the LEDs are supposed to come on but the engine side of the unit is pretty simple and I can't imagine the generator end would use anything to trigger or excite itself directly off the engine side?
This has me stumped admittedly mostly due to my lack of electrical knowledge. It has been a great machine and done everything we ever needed it to at my old job and has been a great workhorse since I acquired it and started my own one man fab business. I repowered it with the Honda kit from repower specialist because the Onan 20 was starting to show and act its age and am looking forward to putting it back on my truck and getting alot more out of it! As I said before, it was working great right after the engine swap AC/DC, I did a few quick beads with it and was going to test out the spool gun before I put the sheetmetal back on and got nothing.
You tell me what thing to check and how to check it and I will just tell me where it is and what it looks like
Thanks for any help guys!
Last edited by 360_scamp; 05-28-2021 at 11:24 AM.
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