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Alternator vs Regulator

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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SoDoWarts
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Re: Alternator vs Regulator

Post by SoDoWarts »

Thanks man! BTW -- considering the issue I"m having with my battery/regulator/alternator and not being able to keep a charge -- have you ever heard that if your security alarm gets activated that it could screw things up and be a big draw on the battery? The reason I mention it, is that on the day this all started I had to break into my car (keys inside the trunk) the alarm went off a couple of times and by the time I got the keys and tried to start the car it didn't turn over, and thusly my first call to AAA for my first jump (as the story begins above). Just wondering if this could possibly be an answer to my charging problem. THanks again.

JRL
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Post by JRL »

I bet I know what your problem is.
One of your locks is messed up and a light stays on all the time.
My project T5 was like this..
I replaced the battery yet 2 days later it died again.
Finally found one lock where the door jamb light was staying on!
Mod note. Jim passed away in early 2022, his contributions to this forum are immortal, and he is missed. RIP

2000 V70R Black, 144,000 miles Wife's R.
2007 V70 2.5T White/Oak 111,000 MILES. Polestar tune, IPD bars, rear spoiler, dark grey Thors, DWS 06, HU850, sub.

jblackburn
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Post by jblackburn »

^^^mine does the same thing. Check the glovebox light too.
'98 S70 T5
2016 Chevy Cruze Premier


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

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JDS60R
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Post by JDS60R »

I agree - any light left on will give you the same symptoms as what you are experiencing.

Please check the car and let us know.
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SoDoWarts
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Post by SoDoWarts »

It's going to be tough to check -- the car's sitting in my volvo guy's lot without a charge. He's waiting for me to tell him whether I want to spend $700 for an alternator or $330 for a regulator. The last time it was jumped it died about a minute later - so I had to have it towed.

JDS60R
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Post by JDS60R »

You can ask him to put a charger on it . Or I'm sure he has a jump box there. Just clamp it on and get in the car . Wait for the lights to turn off and then check every thing.

If you want you can pay him to tell you what the parasitic draw is. He should have tested it already. It is done by disconecting the abttery cable and putting a meter inline. It will tell him the amp draw while the car is sitting (After the internal light go off). With the ECU having a powered memory expect a 50 to 100 milliamp draw. Let us know what you find.
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SoDoWarts
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Post by SoDoWarts »

Update -- last night under the cloak of darkness I went to the to see if I could find where the battery cable meets the fuse box (for any corrossion) but I must have been looking in the wrong place or box - couldn't see it. But I jumped it for about 5 minutes. It started fine, put on the lights, the radio and the Ac. Took it down the street and after about 300 years I felt a loss of power, the ABS and STC lights came on, then about 15 seconds later the ROPS (roll bar) and SRS lights came on (but not the generator/battery light). The car stayed running, the lights stayed on(dimmed) but there was no response from the accelerator! Wierd. Does this sound familiar to anyone.

Back to your comment JDS60R --knowing that he wants some big money from me he'll probably tell that he's already done that. What would be the best pointed and specific question I should ask him about what you suggested? I sorta want to put him spot to prove that for sure it is the alternator.

SoDoWarts
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Post by SoDoWarts »

correction -- make that 300 "yards" not years!

cn90
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Post by cn90 »

Why don't you take the car home, remove alternator and rebuild it for $80 using the info I provided?
2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+

SoDoWarts
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Post by SoDoWarts »

Believe me, I wish I could. But from what I can see that looks like its way beyond me. I have a very low greasey hands index and I'm void of the tips and tricks that are always good (and needed) to know.

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