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4th Gen: Alternator not Charging Battery Issue - FIXED!!

To clarify - that's In Car Entertainment - not frozen water
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arif_manji
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4th Gen: Alternator not Charging Battery Issue - Puzzled!

Post by arif_manji » Mon Nov 01, 2021 11:59 am

vanzep wrote:
Sun Oct 31, 2021 10:05 pm
is there no warning lights on the dash? maybe try a battery booster when starting it up... and check the belt is tight..only issue ive ever had with alternator on a 4th gen ( in 20 years of running them daily) is when the crank pulley came loose but that threw up a warning light on the dash along with the engine cutting out :?
Hi @vanzep

No warning lights on the dash. I will try the booster and see if there is any change. All terminals and belt tightness checked and tightened to the Honda Prelude's detailed manual. When the engine is running, it is smooth as anything and drives absolutely fine
My Cars:
2022 Toyota Supra 3.0 GR PRO
Addictions...
1996 4th Gen Honda Prelude 2.2i VTEC (UK Spec - Converted from a H23A)
1993 4th Gen Honda Prelude 2.2i VTEC Auto LSD (JDM)
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4th Gen: Alternator not Charging Battery Issue - Puzzled!

Post by arif_manji » Mon Nov 01, 2021 12:01 pm

Greg wrote:
Sun Oct 31, 2021 10:23 pm
If the alternator works on another car and is otherwise without fault it can only be continuity between either the battery and the alternator or the exciter circuit and the alternator. There isn't much else technically to it, the charging circuit is pretty simple so if the alternator is definitely ok the problem must be the wiring as mentioned already ;)
My thoughts exactly! Having looked through the manual, I need to investigate the ELD in the fuse box. I have notice there are two types of fuse boxes in these 4th Gen. One that has a ELD with a plug and one without? Does anyone know why this is?
My Cars:
2022 Toyota Supra 3.0 GR PRO
Addictions...
1996 4th Gen Honda Prelude 2.2i VTEC (UK Spec - Converted from a H23A)
1993 4th Gen Honda Prelude 2.2i VTEC Auto LSD (JDM)
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4th Gen: Alternator not Charging Battery Issue - Puzzled!

Post by arif_manji » Mon Nov 01, 2021 12:02 pm

K30DPC wrote:
Sun Oct 31, 2021 11:58 pm
Wires itself should be fine. But you should check all connectors. What you can try is unplugging battery while engine is running. If it will stop than there is no connection between alternator and battery. Loose connections provide high resistance which will not affect multimeter as bad as when you draw higher current.
Hi @K30DPC

I will give this ago and see what happens, thanks.
My Cars:
2022 Toyota Supra 3.0 GR PRO
Addictions...
1996 4th Gen Honda Prelude 2.2i VTEC (UK Spec - Converted from a H23A)
1993 4th Gen Honda Prelude 2.2i VTEC Auto LSD (JDM)
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4th Gen: Alternator not Charging Battery Issue - Puzzled!

Post by arif_manji » Mon Nov 01, 2021 12:14 pm

All,

I have notice there are two types of fuse boxes in these 4th Gen engine bay. One that has a ELD with a plug and one without? Does anyone know why this is? And if corresponds directly with the alternator?
My Cars:
2022 Toyota Supra 3.0 GR PRO
Addictions...
1996 4th Gen Honda Prelude 2.2i VTEC (UK Spec - Converted from a H23A)
1993 4th Gen Honda Prelude 2.2i VTEC Auto LSD (JDM)
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4th Gen: Alternator not Charging Battery Issue - Puzzled!

Post by vanzep » Mon Nov 01, 2021 8:35 pm

No idea - all the ones i have seen have a plug
1996-2000 1993 EG9 Blue Civic 1.6 Vti - Traded in against the BB4
2000-2019 1994 2WS BB4 Milano Red JDM Prelude Si VTEC LSD

2015 on > 1991 4WS BB1 Phantom Pearl Grey JDM Prelude Si VTEC LSD
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4th Gen: Alternator not Charging Battery Issue - Puzzled!

Post by arif_manji » Tue Nov 02, 2021 6:22 pm

vanzep wrote:
Mon Nov 01, 2021 8:35 pm
No idea - all the ones i have seen have a plug
So I have discovered that the UKDM don't have a ELD plug to the engine fuse box and the JDM have a plug.
My Cars:
2022 Toyota Supra 3.0 GR PRO
Addictions...
1996 4th Gen Honda Prelude 2.2i VTEC (UK Spec - Converted from a H23A)
1993 4th Gen Honda Prelude 2.2i VTEC Auto LSD (JDM)
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4th Gen: Alternator not Charging Battery Issue - Puzzled!

Post by vanzep » Tue Nov 02, 2021 7:48 pm

Yes that would match all the ludes i have had were/are jdm.
I may have a spare jdm fuse box with eld so let me know if you need :)
1996-2000 1993 EG9 Blue Civic 1.6 Vti - Traded in against the BB4
2000-2019 1994 2WS BB4 Milano Red JDM Prelude Si VTEC LSD

2015 on > 1991 4WS BB1 Phantom Pearl Grey JDM Prelude Si VTEC LSD
2021 ON > 1998 2WS BB6 White Pearl JDM Prelude Si VTEC

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4th Gen: Alternator not Charging Battery Issue - Puzzled!

Post by arif_manji » Thu Nov 04, 2021 1:18 pm

vanzep wrote:
Tue Nov 02, 2021 7:48 pm
Yes that would match all the ludes i have had were/are jdm.
I may have a spare jdm fuse box with eld so let me know if you need :)
Thanks @vanzep , I've got about 3 UKDM's and 4 JDM ones.
My Cars:
2022 Toyota Supra 3.0 GR PRO
Addictions...
1996 4th Gen Honda Prelude 2.2i VTEC (UK Spec - Converted from a H23A)
1993 4th Gen Honda Prelude 2.2i VTEC Auto LSD (JDM)
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4th Gen: Alternator not Charging Battery Issue - Puzzled!

Post by arif_manji » Mon Nov 08, 2021 6:45 pm

Guys, does anyone know if there is a difference between the UKDM and JDM alternators?

I've noticed that on the UKDM, the alternator plug is:

S FR
IG L

The JDM is:

C FR
IG L

What is the C & S difference?
My Cars:
2022 Toyota Supra 3.0 GR PRO
Addictions...
1996 4th Gen Honda Prelude 2.2i VTEC (UK Spec - Converted from a H23A)
1993 4th Gen Honda Prelude 2.2i VTEC Auto LSD (JDM)
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4th Gen: Alternator not Charging Battery Issue - Puzzled!

Post by RattyMcClelland » Mon Nov 08, 2021 7:16 pm

I was about to reply but you may have discovered the issue. You have to make sure the alternator is like for like and not from a JDM car.

This was my issue 6 years ago. The last page may answer your problem. Only a JDM 5th gen alt works on my JDM Type S. I tried all other alternators for prelude and all didn't work.

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