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Yawn.
2016 Focus ST-3 & 2021 Hyundai i20N
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13,813 Posts
Discussion Starter · #1 ·
Randomly coming on for periods, no certain length of time

Battery is 2-weeks old - wiring clamps are tight

Checked Voltage at battery with engine running at idle - 14.22 Vdc

Belt looks ok (quick check as was raining and hadn't long been in from work)


Damp?

Not sure what else it could be, don't fancy having to buy an Alternator...
 

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A tired Vxon user
Joined
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1,961 Posts
Checked Voltage at battery with engine running at idle - 14.22 Vdc
That's a tad high for idling. Much more than that when revving and it will be well over charging. Dis you take any readings while revving?

Have you been through any large puddles?
 

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Yawn.
2016 Focus ST-3 & 2021 Hyundai i20N
Joined
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13,813 Posts
Discussion Starter · #3 ·
That's a tad high for idling. Much more than that when revving and it will be well over charging. Dis you take any readings while revving?

Have you been through any large puddles?
I haven't taken voltage figures while driving it - will do that - though the idling figures dont look too dis-similar from my old Cavalier or Escort, and they never really increased much over 14.5 when driving...

I haven't driven it through any large puddles, but my missus has, as its her car - but it was doing it a little before it was forded

We had the Radiator replaced last week, maybe the garage disturbed something - earth maybe?

I'll WD40 the connections etc and check any earth straps
 

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Fat stig!!!
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1,442 Posts
Now fella!! mine does come on now and again when going through farirly deep puddles they are located prettie low mine somtimes stops on on start up and goes off after 2500rpm i've had mine bench tested as was thinking over charging..
 

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A tired Vxon user
Joined
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1,961 Posts
If the belt is damp it will slip without noise. Best bet is to let it idle for ten mins after start up and check it. I'd expect it to be no more than around 13 volts on idle with a new battery. Check when revving to 2500rpm and 3000rpm. They love over charging beyond 3000k. If it has an air bag usually the warning lamp will flag up.

Don't forget the relay behind the drivers kick panel, could just be a dodgy connection.
 

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A tired Vxon user
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1,961 Posts
No Airbag Warning Flashing, but then it doesn't have an Airbag Wheel

Relay in Kick Panel? I'm new to the TD's so aren't too clued up... Yet :lmao:
You will be if you have to fork out £150 for an alternator. It's just about the only thing that lets the car down and they always seem to blow in cold weather:( Alternators i mean.
 

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Yawn.
2016 Focus ST-3 & 2021 Hyundai i20N
Joined
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13,813 Posts
Discussion Starter · #8 ·
I'll check the voltage etc later

Hopefully it's something simple

The car has been trouble free for the previous owner, we've had it 3-4 weeks now, and the cold has already claimed 2 victims - Battery and Radiator :lmao:
 

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A tired Vxon user
Joined
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1,961 Posts
I'll check the voltage etc later

Hopefully it's something simple

The car has been trouble free for the previous owner, we've had it 3-4 weeks now, and the cold has already claimed 2 victims - Battery and Radiator :lmao:
Lol, just make sure it's not the Alternator, cause it will kill the new Battery before you know it :Cool2:
 
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