Lucas RB340 25 Amp needed
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Post by: 1963 S1 » Thu May 25, 2023 2:55 pm
Hello,
I'm looking for an NOS Lucas RB340 25 Amp voltage regulator. If you have one for sale or may know of a vendor that does, please let me know. Thank you.
Richard
I'm looking for an NOS Lucas RB340 25 Amp voltage regulator. If you have one for sale or may know of a vendor that does, please let me know. Thank you.
Richard
- 1963 S1
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Post by: Andy8421 » Thu May 25, 2023 3:04 pm
Richard,
A number of the usual suspects sell RB340 copies. Does it have to be a genuine Lucas unit?
Andy.
A number of the usual suspects sell RB340 copies. Does it have to be a genuine Lucas unit?
Andy.
68 Elan S3 HSCC Roadsports spec
71 Elan Sprint (being restored)
32 Standard 12
Various modern stuff
71 Elan Sprint (being restored)
32 Standard 12
Various modern stuff
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Post by: StressCraxx » Thu May 25, 2023 3:29 pm
I have a used one in the box with the spade terminals. Yours for the cost of shipping.
Best regards,
Dan Wise
Best regards,
Dan Wise
There is no cure for Lotus, only treatment.
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Post by: 1963 S1 » Thu May 25, 2023 4:58 pm
Thank you for your replies. So far I've only been able to find one vendor selling knock-off 25Amp regulators. The most common version available is the 22Amp model, and can be sourced from trusted suppliers.
Dan I'll reach out to you. Thank you.
Dan I'll reach out to you. Thank you.
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Post by: 1963 S1 » Thu May 25, 2023 10:48 pm
Dan did not have a spare RB340 25Amp regulator. Thank you Dan for checking your spares.
My search continues. If anyone has one they are willing to part with please let me know.
Richard
My search continues. If anyone has one they are willing to part with please let me know.
Richard
- 1963 S1
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Post by: Andy8421 » Fri May 26, 2023 9:34 am
Richard,
As far as I can see, a 22amp control will work with a 25amp dynamo, you just won't get the full 25amps output from the dynamo.
Are you hoping the squeeze the last 3 amps out of the system?
Andy.
As far as I can see, a 22amp control will work with a 25amp dynamo, you just won't get the full 25amps output from the dynamo.
Are you hoping the squeeze the last 3 amps out of the system?
Andy.
68 Elan S3 HSCC Roadsports spec
71 Elan Sprint (being restored)
32 Standard 12
Various modern stuff
71 Elan Sprint (being restored)
32 Standard 12
Various modern stuff
- Andy8421
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Post by: 1963 S1 » Fri May 26, 2023 4:25 pm
Thanks Andy. Yes, I'm trying to provide the full potential for the C40L generator and downstream accessories.
I'm still searching for an RB 340 25 Amp regulator; where the following Lucas part numbers should work: 37342, 37498, 37529, 37543, 37568, and 37574.
I'm still searching for an RB 340 25 Amp regulator; where the following Lucas part numbers should work: 37342, 37498, 37529, 37543, 37568, and 37574.
- 1963 S1
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- Joined: 14 Jan 2016
- Location: USA
Post by: Andy8421 » Sat May 27, 2023 6:11 am
Richard,
Depending on how keen you are feeling, it looks straightforward to adjust the current output of the regulator. Lucas did an excellent series of field service manuals, the one below is for the RB340.
https://www.mg-cars.org.uk/imgytr/pdf/lucas.pdf
Page 21 has a schematic of the RB340 innards, and page 19 explains how to adjust the current regulator.
I would guess that the 22 and 25 amp versions of the RB340 have the same innards, but are adjusted differently. A bit of fiddling should be able to turn a 22amp version into a 25amp version.
Good luck.
Depending on how keen you are feeling, it looks straightforward to adjust the current output of the regulator. Lucas did an excellent series of field service manuals, the one below is for the RB340.
https://www.mg-cars.org.uk/imgytr/pdf/lucas.pdf
Page 21 has a schematic of the RB340 innards, and page 19 explains how to adjust the current regulator.
I would guess that the 22 and 25 amp versions of the RB340 have the same innards, but are adjusted differently. A bit of fiddling should be able to turn a 22amp version into a 25amp version.
Good luck.
68 Elan S3 HSCC Roadsports spec
71 Elan Sprint (being restored)
32 Standard 12
Various modern stuff
71 Elan Sprint (being restored)
32 Standard 12
Various modern stuff
- Andy8421
- Coveted Fifth Gear
- Posts: 1016
- Joined: 27 Mar 2011
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Post by: StressCraxx » Sat May 27, 2023 10:20 pm
Check your PMs, found the RB340 I had stashed away.
Dan
Dan
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Post by: 1963 S1 » Mon May 29, 2023 5:34 pm
StressCraxx wrote:Check your PMs, found the RB340 I had stashed away.
Dan
Thank you, Dan, for offering a 22Amp version. I may attempt Andy's suggestion via the literature he shared.
If anyone has a 25Amp Lucas RB340 voltage regulator, please let me know. Thank you in advance to the LotusElan.net community.
Richard
- 1963 S1
- Second Gear
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- Joined: 14 Jan 2016
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