All warning lights on/off/on/off...
Junior Member
Joined: Oct 2021
Posts: 1
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Having the same problem
Ah ha! This may be a good clue: In my original posting I indicated that the headlights seems to get brighter when the warning lights came on. Tonight, I noticed that not only do the headlights get brighter, but the blower fan definitely jumps up a notch in speed whenever the dash warning lights come on, and then drops back to normal speed when the warning lights go out. So, what we have here is an intermittent increase in system voltage across the board. Can be due to grounding? Is there anything other than the voltage regulator that can cause voltage to spike in such a way?
If the warning lights come on with increased regularity, I'll try to get a voltage reading at the battery as this is happening and report back.
If the warning lights come on with increased regularity, I'll try to get a voltage reading at the battery as this is happening and report back.
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Member
Joined: Nov 2011
Posts: 40
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From: Geneva, NY
I am having the exact same problem.
Now, if you also have the same Bosch alternator I had on my 1992 (seven years ago.... sniff... God, miss her)... where was I? Oh yes.
You likely have a bad voltage regulator, and if it's on a Bosch alternator, you are going to have to get another complete alternator. If you can confirm that is is indeed the voltage regulator, visit IPD.com: they have the correct part. You'll need a Voltmeter, knowledge of where to hold the + and - probes (easy... even the Autozone schmucks can show you), and you'll need to catch it in the act of overcharging. You can also download the diagnostic codes from the OBD system (search the forum for the method, it's very easy). If you get the code for "overcharge/undercharge", it's the voltage regulator.
Or you can gamble that I'm right, fire the parts cannon, and just replace it and see if it's cured.
Senior Member
Joined: Feb 2019
Posts: 110
Likes: 1
no warning lights
My alternator is smoked and all of the warning lights went dead on my 1988 240 sedan. Speedo too no longer operates. When I turn the ignition on I thought I would have power behind the board on the blue wire to the speedo and the solid blue wire to the large female circular connector, but no dice. The Bentley manual schematics leave much to be desired. Where can I get a better schematic.
This all began by replacing the odometer gears to get the odometer working. I have made sure the connection to the ignition switch is secure, and power does go to the fuse that gives power to the blue wires when the ignition is on.
Is there a connector in the harness that I might have loosened?
This all began by replacing the odometer gears to get the odometer working. I have made sure the connection to the ignition switch is secure, and power does go to the fuse that gives power to the blue wires when the ignition is on.
Is there a connector in the harness that I might have loosened?
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