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Discussion Starter · #1 ·
Hey, need some ideas with some electric issues.
Volvo V50, 2007 mod.
1.6D(DV6 engine, D4162T 80kW)

Symptoms; Lights flickering, Voltage moves from 11.4v to 16.6v.
Before both tests battery voltage was measured to approx. 12v no pulsating current has been experienced with engine not running.
Voltage measured to stable 14.5v while engine was running before both tests.

Occured after a DPF replacement, checked cabling to alternator.

test 1
Ran the car down the highway, suddenly warning lights flashed for a short sec in the dashboard, radio turned on and off, lights started to flicker. Stopped the car, measured the voltage and it was sporadic between 11.4v and 16.7v. for about 20sec. voltage normalized at 14.4v, lights stopped flickering.

Was not able to reproduce the sporadic current again during this 1 hour session.

test 2
Car was started and let idle for about 1min when lights started to flicker. The voltage was sporadic between 11.4v and 16.7v. Let it run for another 2minutes, voltage normalized.

Errors currently in system.


Any ideas?
 

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98 S70 Base, 06 S40 T5 M66 FWD, 08 C70 M66, 11 XC90 V8, 13 C70 P*
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I would pick the alternator is failing.

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+1. That or maybe the tensioner pulley is going bad.

BD

'98 S70 GL, '06 S40 M66 T5 FWD, '08 C70 M66 T5 Premier Plus, '11 XC90 V8 AWD, '13 C70 T5 Platinum P* ('94 854T, '05 S60 2.5T FWD, & '04 XC90 2.5T AWD R.I.P.)
 

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Discussion Starter · #4 · (Edited)
Also been my idea, but can an alternator sporadic malfunction then revert back normal function?

I mean in my country that alternator costs 500$ and thats only for the part, anything i might check, that can give an indication that it is infact the alternator?
 

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98 S70 Base, 06 S40 T5 M66 FWD, 08 C70 M66, 11 XC90 V8, 13 C70 P*
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Also been my idea, but can an alternator sporadic malfunction then revert back normal function?

I mean in my country that alternator costs 500$ and thats only for the part, anything i might check, that can give an indication that it is infact the alternator?
Mine acted similarly to yours before it finally quit on me. It didn't die immediately. Think it took about a week before it refused to keep the car and electrical systems running.

It might just be the voltage regulator that's mounted on the alternator, so that could save you some money. But I don't know how you can verify that without removing the alternator and doing a bench test. I'm sure there are far more skilled mechanics who will provide input.

BD

'98 S70 GL, '06 S40 M66 T5 FWD, '08 C70 M66 T5 Premier Plus, '11 XC90 V8 AWD, '13 C70 T5 Platinum P* ('94 854T, '05 S60 2.5T FWD, & '04 XC90 2.5T AWD R.I.P.)
 

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The 16.6V reading is very concerning and likely indicates that the voltage regulator (likely in the alternator) is failing. It should max around 14.4V. You could start damaging electronics, blowing light bulbs and possibly damage the battery.

My vote is replace the alternator. I am assuming the regulator is part of your alternator but I am not familiar with your engine.
 

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Discussion Starter · #7 ·
Ye the regulator is part of the alternator! ill change it and see what happends, will give an update!
 
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