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Antharro · Apr 13th, 2018, 23:14

Another problem my V40 has - voltage surging!

Only happens when warm or hot. I'll be driving along happily and a load of warning lights come on on the dash - parking brake, info, SRS, washer bottle level, etc. The headlights become brighter, the fan runs faster, the wipers run faster, the dash lights up like a Christmas tree, and sometimes the radio turns off, presumably to protect itself.

My feeling on this is the voltage regulator is on its way out - the alternator is obviously providing voltage, but the regulator can't keep it at 14v. Does this sound right?

If so, would this item on eBay do the job? And if so, where do I fit it? There looks to be a cover on the back of the alternator where the wires are attached; presumably I remove this and I'll find it inside, bolted to the back of the alternator?

Any help appreciated!

Apr 13th, 2018, 23:14	#1
Antharro New Member Last Online: Aug 16th, 2018 01:21 Join Date: Sep 2017 Location: "The South"	V40 power surging Another problem my V40 has - voltage surging! Only happens when warm or hot. I'll be driving along happily and a load of warning lights come on on the dash - parking brake, info, SRS, washer bottle level, etc. The headlights become brighter, the fan runs faster, the wipers run faster, the dash lights up like a Christmas tree, and sometimes the radio turns off, presumably to protect itself. My feeling on this is the voltage regulator is on its way out - the alternator is obviously providing voltage, but the regulator can't keep it at 14v. Does this sound right? If so, would this item on eBay do the job? And if so, where do I fit it? There looks to be a cover on the back of the alternator where the wires are attached; presumably I remove this and I'll find it inside, bolted to the back of the alternator? Any help appreciated! Last edited by Antharro; Apr 13th, 2018 at 23:17.