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B200F estate

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Old Mar 21st, 2019, 12:56   #1
timetrip
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Default B200F estate

Hi Again Guys,,Another glitch to solve...why when i turn off my dipped beam at the switch does the engine lose power / try to stall,,,but recovers....taking power from somewhere....????? any suggestions... I might add that mainly when at idle.
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Old Mar 21st, 2019, 18:22   #2
BrianH
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Go to the metal rely behind the glove box. The power connection over heats and causes all sorts of problems. I'm just remaking it for the third time now. The easy route is to slide the connecter off and on a few times to see if makes a difference.


BrianH 245GL 1989 707,851 mls. LPG
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Old Mar 22nd, 2019, 19:08   #3
Clifford Pope
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Quote:
Originally Posted by timetrip View Post
why when i turn off my dipped beam at the switch
Do you when you switch it back to main beam, or when you turn the headlights off at the light switch?
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Old Mar 22nd, 2019, 20:03   #4
timetrip
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when i turn it from dipped to side lights....main beam doesn't do anything ...although my Bentley mechanic said it could be the alternator as it drains quite a bit of power..?
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Old Mar 22nd, 2019, 20:05   #5
timetrip
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yes will tyr that Brian....worth a try .
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Old Mar 25th, 2019, 09:43   #6
AlexO
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I've actually had this problem for years, I just assumed it was a volvo thing! The engine only dips slightly so I havent bothered fixing it but I might try your fix Brian when I'm fiddling next.

Cheers

Alex
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Old Mar 25th, 2019, 18:04   #7
Clifford Pope
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It sounds like a poor earth, causing a voltage drop whenever a heavy current is switched on.

Mine often did that little falter in those circumstances, but it was only recently after I had to do a lot of diagnosing to counter the effects of heavy rain and deep puddles that I found the main earthing point, hidden behind the battery.

Apart from fixing the damp problem, I noticed later the falter had disappeared too.
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Old Mar 28th, 2019, 00:11   #8
Nicholas Lewin
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Useful as ever

Mine does it both from the light switch and the heater fan - just a brief falter as you operate the switch - it's not a problem unless the engine is under load at the time

Thanks for the fix!
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