Dash Waning Lights
10-01-2021, 12:58 PM
Post: #1
Dash Waning Lights
Hi all,

Yesterday at my garage idling and prepping for the AE86 meeting in Portugal some warning lights came on.

First: rear light warning lights (no lights were blown)
Second: Front light warning light (no lights blown)

After a 1min or so, the Battery Charge light came on...

I did a quick measurement with a multimeter and only got 12.xx Volts...

I bet this is an alternator issue and without power, the grounds are all messed up and lights come on... Right? Smile
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10-01-2021, 01:22 PM
Post: #2
Dash Waning Lights
Well, it does sound like an alternator issue, but I'm not sure which warning lights you are refering to.
High beam / parking brake?
Some of the warning lights get switched through a bulb test relay by the contact switch (all lights come on before you start).

FABRICA MI DIEM, PVNC!
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10-01-2021, 01:37 PM (This post was last modified: 10-01-2021 01:39 PM by pack.)
Post: #3
Dash Waning Lights
Hey Ivan,

These ones!

[Image: AEU86 AE86 - Dash Waning Lights]

I am running the digital cluster Smile

Usually these lights come on when a bulb is shut.... But all my lights are working properly.

I guess this is a ground issue, since the alternator is failing to charge somewhere....
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10-01-2021, 04:12 PM
Post: #4
Dash Waning Lights
Ah, that would explain it. That's the only one I dont have schematics for Sad

FABRICA MI DIEM, PVNC!
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10-01-2021, 05:59 PM
Post: #5
Dash Waning Lights
Neither do i!

And i don't think there are any.....

Bought a new alternator and problem is solved!
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10-01-2021, 07:42 PM
Post: #6
Dash Waning Lights
I'm sure some sort of manual must exist for digital dash electrical wiring, but it is very likely Japan-only, which makes it difficult to find.

FABRICA MI DIEM, PVNC!
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10-03-2021, 09:43 PM
Post: #7
Dash Waning Lights
As far as I know the rear lights warning lamp indicates there is either higher or lower resistance than usual (lamp half broken or completely broken). It could be caused by either a bad ground or corrosion on your bulbs. So maybe the circuit measuring this was half assed due to the lower voltage? Dumb question

1982 - TA60 Carina 4dr sedan - fun cruiser
1983 - AE86 Sprinter Trueno - import project
2013 - Honda Civic sport - daily driver
2004 - AEU86 dot ORG - daily domain

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[Image: AEU86 AE86 - Dash Waning Lights]
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10-06-2021, 01:00 PM
Post: #8
Dash Waning Lights
Probably... i've already managed to reach more guys with the digital tacho and all mentioned that when alternators go bad the warning lights come on!

So, this circuit is also affected by (maybe) bad ground or messed ground....
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