Charging Voltage - alarm on high voltage
Hello All

I have a madman 2 fitted to Die Valk, mostly for EGT purposes but it also served as a low battery alarm set at 12V.

lately I have had high voltage alarm trips. my high voltage alarm is set at 14.3V - checking the system I see max value at 15.3V

The alarm only trips during idling and only for about a half a second at a time. but its doing so constantly. trip for half a second, then nothing for 2 or 3 seconds and then trip again etc. its doing this every now and then and only at idling. when I rev the car standing still it goes away and when I drive the charging voltage averages around 13.8V which is what it has always done.

So anything I should worry about? is my alternator packing up? any and all help appreciated as always.
Gerhardt Kirchner

Tiny - 2007 Prado
SOLD :cry: Die Goue Valk - 2006 Gen3 SWB 3.2DiD Automatic

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Re: Charging Voltage - alarm on high voltage
Probably not your alternator. Possibly regulator but I would first check out the batteries as the first culprit.

CATS
2009 Pajero 3.2 DiDc Lwb GLS (Gen4) - Casper (Starting to grow on me)
2001 Pajero 3.2 DiD Lwb GLS Manual (Gen3) - Snoopy (SOLD but not forgotten)
2008 Pajero 3.2 DiDc Lwb GLS Auto (Gen4) - Silvester (SOLD)
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andrew.ashton
Re: Charging Voltage - alarm on high voltage
Maybe try to find someone with an oscilloscope to try to see what is really happening.
Re: Charging Voltage - alarm on high voltage
Hi Guys,

Some general comment: When I had my dual battery system installed the salesman told me that my alternator was overcharging and that I should have it attended to. Today, eight plus years later, it is still charging and my car and battery are still working.

Cloyd
andrew.ashton
Re: Charging Voltage - alarm on high voltage
cloyd wrote:Hi Guys,

Some general comment: When I had my dual battery system installed the salesman told me that my alternator was overcharging and that I should have it attended to. Today, eight plus years later, it is still charging and my car and battery are still working.

Cloyd
I think the difference here is that it is an aircraft grade instrument, not a salesman, that is saying that there is something amiss.
Re: Charging Voltage - alarm on high voltage
Hello all. Thanks for the comments.

So yesterday, after my post, i had an interesting episode. I unlocked the car, as normal, climbed in and when i turned the key the whole car was dead. Tried it a couple of times. Nothing. Fearing my battery is kaput i swear, climb out and as i close the door the lights go back on! Started her up and drove home.

This supports Cats battery as the first check point. All terminals felt nice and tight, but I nevertheless took them off, cleaned everything properly and re-fastened them.

Today no problem yet or any alarms going off. Will keep an eye and have the battery checked out. I see the battery is marked with Nov 2012

2.5 years old. How long should they last?

Thanks
Gerhardt


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Gerhardt Kirchner

Tiny - 2007 Prado
SOLD :cry: Die Goue Valk - 2006 Gen3 SWB 3.2DiD Automatic

Image
Re: Charging Voltage - alarm on high voltage
Just longer than the warranty :-), which is usually 2 years, so you are about at the right age for replacement.

CATS
2009 Pajero 3.2 DiDc Lwb GLS (Gen4) - Casper (Starting to grow on me)
2001 Pajero 3.2 DiD Lwb GLS Manual (Gen3) - Snoopy (SOLD but not forgotten)
2008 Pajero 3.2 DiDc Lwb GLS Auto (Gen4) - Silvester (SOLD)
Image
User avatar
Affiliate Member
Re: Charging Voltage - alarm on high voltage
check the ground straps to chassis and engine. If you can, take them off, give them a light sanding and re-attach.
Re: Charging Voltage - alarm on high voltage
Andrew,

Being aircraft quality or only a decent quality multi meter, the voltage reading will still be the same.

Cloyd
Re: Charging Voltage - alarm on high voltage
Sounds like a loose terminal and not the battery.
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