Electrical Issues/Interference.

[MildSeven]

I tried grounding directly to the chassis. no change.

 

I have a voltmeter led thing hooked up in my glove box.

- I noticed when the reading is like 12.5+ or something the noise is present.

- if I turn on the fan, aux fan, lights... the noise will diminish or go away all together < 12v

 

need to spend more time on this

[MildSeven]

On 8/8/2018 at 3:25 PM, MildSeven said:

I tried grounding directly to the chassis. no change.

 

I have a voltmeter led thing hooked up in my glove box.

- I noticed when the reading is like 12.5+ or something the noise is present.

- if I turn on the fan, aux fan, lights... the noise will diminish or go away all together < 12v

 

need to spend more time on this

 

I fully charged the batt... and the noise is even more predominant + it happens at a lower RPM.

 

I need to invest more time looking at this... but with the lack of info online it's depressing.

Edited September 10, 2018 by MildSeven

[Dudeland]

How are the bearings on your alternator? If you spool it up, it creates a magnetic field that would play on the armature. More amperage would be a stronger field (maybe?) Take the belt off and see if you get the same noise. In the video it sounds mechanical.


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[Healey3000]

Hi,

 

A couple of things caught my eye - you said that low-load voltage was around 12.5 volts and that the noise diminishes as a function of load.

 

Isn't 12.5 volts a bit low?  I ask this because I haven't actually measured mine but I would expect something in the 13.5 to 14.4 volt range (unless '02 systems are really low normally).  The fact that noise reduces as you increase the load suggests that your voltage regulator is a contributor.  At low load, it disengages more frequently and it's possible that this action is part of the issue.  Do you have another you can swap out to try?

 

The alternator could also be the source.  How old is it?

[Dudeland]

1 hour ago, Healey3000 said:

 

 

Isn't 12.5 volts a bit low?  I ask this because I haven't actually measured mine but I would expect something in the 13.5 to 14.4 volt range (unless '02 systems are really low normally). 

 

1

I was thinking the same thing

 

 

[Schnellvintage]

7 minutes ago, Dudeland said:

I was thinking the same thing

 

 

I strongly agree also.  A normal charging system should maintain a voltage between 13.5 to 14.5, with a good battery and connections, even under max load, it shouldn't drop below 13.1

[MildSeven]

14 hours ago, Dudeland said:

How are the bearings on your alternator? If you spool it up, it creates a magnetic field that would play on the armature. More amperage would be a stronger field (maybe?) Take the belt off and see if you get the same noise. In the video it sounds mechanical.

 

By mechanical, you mean, interference created by movement (something spinning, etc).  I hadn't thought of this as a trouble shooting option. Thanks!

 

12 hours ago, Healey3000 said:

A couple of things caught my eye - you said that low-load voltage was around 12.5 volts and that the noise diminishes as a function of load.

 

Isn't 12.5 volts a bit low?  I ask this because I haven't actually measured mine but I would expect something in the 13.5 to 14.4 volt range (unless '02 systems are really low normally).  The fact that noise reduces as you increase the load suggests that your voltage regulator is a contributor.  At low load, it disengages more frequently and it's possible that this action is part of the issue.  Do you have another you can swap out to try?

 

The alternator could also be the source.  How old is it?

 

It sounds low to me... it occurs with aux fan on + lights + stereo (+ maybe fan in car).

 

Not sure of the alternator age, I have a friend starting an 02 project. I will go borrow his alternator to try it out.

 

Edit: since it's an inexpensive test, I just ordered a Beru Voltage Regulator.

 

10 hours ago, Schnellvintage said:

I strongly agree also.  A normal charging system should maintain a voltage between 13.5 to 14.5, with a good battery and connections, even under max load, it shouldn't drop below 13.1

 

thanks everyone!!!!

 

Will report back,

Anthony

Edited September 11, 2018 by MildSeven

[Dudeland]

It almost sounds like something is rolling around in your Bell housing. But yes, mechanical. Maybe check your motor mounts, perhaps your fan is hitting the shroud when the motor moves?


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[MildSeven]

It almost sounds like something is rolling around in your Bell housing. But yes, mechanical. Maybe check your motor mounts, perhaps your fan is hitting the shroud when the motor moves?


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Ah, maybe on the video it sounds like that... but it's crackling over the speakers, the fasten seatbelt and A/F senso gauge flicker at the same time.

If I turn-off the stereo, the crackling goes away but the flickering on seatbelt indicator + a/f gauge messing up remains... with revs.

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[Dudeland]

AHHH ok, sorry. It must be the video.  That said I would still check your alternator you are not getting enough juice.   

 

[Simeon]

Any issues with glowing L light? Maybe you have had a failure of the internal diodes in the alternator and it is outputting AC? You could try putting a multimeter set to AC across your battery when it is happening and seeing if you get any significant AC output. 

[MildSeven]

Just to follow up on this thread.

 

I "borrowed" a friends alternator. Which i was happy to see turned out to be a 70amp unit.

 

The crackling noise is gone but I only installed in a couple of days before storage .

 

Thanks again everyone for your input.

 

Edited November 27, 2018 by MildSeven

[Healey3000]

Glad you solved it.  Must have had leaky diodes in your old one.