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Author Topic: Call for pictures and suggestions. New ST3 Install  (Read 944 times)

veggie

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Call for pictures and suggestions. New ST3 Install
« on: November 13, 2023, 03:50:22 AM »
Hi all,

I just installed a new ST-3 head that I had sitting in a crate for the last 10 years.
The wiring looked good and the windings are copper.
When I gave the system a test run (no load), the unit was surprisingly quiet compared to the 3600 rpm unit that I removed.
No screeching and electrical whining noises which both of my 3600 rpm heads made even when unloaded.

I now need to wire the head into my electrical system as two 120 volt outlets (one from each phase). That part is simple enough.
However, it is doubtful that the 4 open connections on the back of the junction box would pass north American electrical codes, so I'm
looking for ideas and pictures of what other members have done to re-wire, reconnect, or change the basic ST design,
Some people have replaced the metal box with a PVC "Scepter" j-box. Others use the stock metal j-box.

Please let me know what you did with yours, and send pictures if possible.
Here's what mine currently looks like....

<click picture to enlarge>
« Last Edit: November 13, 2023, 03:53:45 AM by veggie »
- 6/1 GM90 Listeroid - Delco 33si Alternator
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- JiangDong R165 Air cooled - 2 kw
- Changfa S195 (Waiting for a project)

38ac

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Re: Call for pictures and suggestions. New ST3 Install
« Reply #1 on: November 14, 2023, 09:03:21 PM »
I am more than a little embarrassed to show pictures of my work next to your craftsmanship but here is how I redid my ST15 junction box. The wiring inside is relatively simple but varies with the output you desire. I bought a 8"x8" box and a 3 lug junction block. Also important is to replace the OEM rectifier. I used a 1050 diode. It is also important to heat sink the diode to the box.  This has been in service for 10 years now. Hadn't had the cover off for a long time and looks like I need to blow it out!
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veggie

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Re: Call for pictures and suggestions. New ST3 Install
« Reply #2 on: November 15, 2023, 06:23:35 PM »

Thanks 38AC,
That box you installed is much better that the thin sheet metal unit that comes with the ST heads.
Also, I will take note of the rectifier advice and buy backup.

cheers
- 6/1 GM90 Listeroid - Delco 33si Alternator
- Changfa R175 - Lease/Neville Alternator
- JiangDong R165 Air cooled - 2 kw
- Changfa S195 (Waiting for a project)