dual rectifier alternator
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=131321
Printed Date: May 10, 2025 at 5:03 AM
Topic: dual rectifier alternator
Posted By: still_walkin
Subject: dual rectifier alternator
Date Posted: May 01, 2012 at 4:49 AM
i saw these online and i was looking for reviews on what people thought about them and couldnt find nothing . so my question go with this type of alternator or a HO alternator
https://store.alternatorparts.com/cs144-series-dual-rectifier-alternators.aspx ------------- 1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Replies:
Posted By: DYohn
Date Posted: May 01, 2012 at 9:08 AM
Those look like HO alts to me... ------------- Support the12volt.com
Posted By: still_walkin
Date Posted: May 01, 2012 at 9:14 AM
Right but the ones I dealt with only have one set of rectifers and they are inside the alts casing .is there any difference to the salts output with a dual set of rectifiers bridged
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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Posted By: DYohn
Date Posted: May 01, 2012 at 10:00 AM
No idea, never used one that I klnow of, but the theory is good. ------------- Support the12volt.com
Posted By: oldspark
Date Posted: May 02, 2012 at 11:28 PM
Apparently the diodes are the major source of failure in HO alternators.
In my experience with normal alternators, the main diodes are not a problem - except for foray with Bosch which blew after jump starting and also just running a flat battery (ie, same effect as "after" a jump start).
If high capacity diodes are difficult or expensive to get with HO alternators, I can see why 2 sets of cheaper or available diodes are used.
Whether they are needed or not is another issue. (What is their replacement cost? Is an easy to replace single-diode set an option? Etc.)
Posted By: still_walkin
Date Posted: May 03, 2012 at 12:53 AM
In other words two sets of cheap diodes are better than one.
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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Posted By: oldspark
Date Posted: May 03, 2012 at 2:49 AM
I did NOT say that.
Posted By: still_walkin
Date Posted: May 03, 2012 at 4:35 AM
So is it worth the buy or stick with the regular hi output alts
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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Posted By: haemphyst
Date Posted: May 07, 2012 at 9:31 AM
They're probably the same diodes, just pressed into a second heat-sink, and attatched to the outside of the alternator case.
IF those photos are accurate, then the bridge attached to the outside looks exactly like every internal bridge I've ever seen - my guess is it's just a paralleled set, clamped to the outside. Paralleling a second set of diodes simply reduces the stress that a single set would see, in theory improving the life-span of any given diode.
Depending on how they're clamped to the outside, I can see that the external bridge set looks like it actually interferes with air flow for the internal set, thus offsetting any claimed stress gains.
I can't see any gain, really... A gain in one direction, with a corresponding loss in the other. Not worth it, AFAIAC. The prices do look a little more reasonable than a comparable HO alternator with a single internal bridge, though...
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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
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