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Voltage regulator replacement?

Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. In this forum you'll find S40/V40-specific owners asking and answering questions on maintenance, ownership, repairs, tutorials and almost every do-it-yourself thing you can do to save money owning these Volvos.

1996 - 2004 S40
1996 - 2004 V40

olddaddy
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olddaddy

Voltage regulator replacement?

Post by olddaddy » Tue Dec 10, 2019 6:16 pm

Our 2000 V40 had a dead battery recently and the codes indicated, T2251 voltage reg failed, diodes passed......So, I am assuming I need to replace the voltage regulator and not the entire alternator. Am I right? I think I can do the regulator, but the alternator would be a trip to the mechanic. Let me know.
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alschnertz
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alschnertz

Re: Voltage regulator replacement?

Post by alschnertz » Thu Dec 12, 2019 3:08 pm

I think the voltage regulator is internal to the alternator and not a generally replaceable part. But I may be wrong on that and please correct me if so.

Changing the alternator is not the worst job to do on a S(V) 40, but you will need a decent assortment of tools and a bit of patience.
I've done it a few times on my '01.
'60 PV544, '68 220, '70 145S, '86 745T, '95 854T, '01 S40
'84 Prelude
'06 MPV
'13 Ford Focus SE

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RickHaleParker
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Re: Voltage regulator replacement?

Post by RickHaleParker » Thu Dec 12, 2019 5:24 pm

2019-12-12.png
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Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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alschnertz
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alschnertz

Re: Voltage regulator replacement?

Post by alschnertz » Fri Dec 13, 2019 3:19 pm

I see. Will have to take a look to see how accessible it is.

Things are pretty tight under the S40 hood and I just don't remember how easy it is to get to the back side of the alternator.
Off the top of my head, I think it's under the PS pump.
'60 PV544, '68 220, '70 145S, '86 745T, '95 854T, '01 S40
'84 Prelude
'06 MPV
'13 Ford Focus SE

olddaddy
Posts: 77
Joined: Wed May 30, 2007 6:59 pm
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olddaddy

Re: Voltage regulator replacement?

Post by olddaddy » Fri Dec 13, 2019 4:16 pm

I watched some videos and decided to have a go at it, just the regulator, not the alternator. I’ll report back on the outcome.
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