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Ignition on 12v power in Engine bay

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

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

cidylong
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Joined: Tue Jun 16, 2020 2:11 am
Year and Model: 1995-850SE
Location: Gold Coast
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cidylong

Ignition on 12v power in Engine bay

Post by cidylong » Tue Jun 16, 2020 2:43 am

Hi. Sir/Madam

My car: 1995 850SE station wagon.

My ECU not get proper temperature value from my temp sensor, it always shows about 70°C event a brand new sensor installed, so ECU never send coolant fan "on" signal to coolant fan controller 1398845.

I'm trying to create a new fan controller logic system by using Davies Craig 0401 mechanical thermatic switch plus a 40A relay to control my coolant fan.

My problem is: I can't find +12V power supply in Engine bay under ignition on position to set up a fan controller to let the coolant only works on key on. As result, I have to use the batter +12V instead, this will make the coolant fan drain out battery some time.

Any one have any idea, please advise!

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erikv11
Posts: 9748
Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850, S/V70, 06 S60R
Location: Iowa
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erikv11

Re: Ignition on 12v power in Engine bay

Post by erikv11 » Tue Jun 16, 2020 11:37 am

You can use the yellow accessory connector under the dash. I haven't done it myself but there are a couple grommets in the firewall you can use to pass a wire from there to the engine bay.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

cidylong
Posts: 2
Joined: Tue Jun 16, 2020 2:11 am
Year and Model: 1995-850SE
Location: Gold Coast
Has thanked: 0
Been thanked: 0
Australia
cidylong

Re: Ignition on 12v power in Engine bay

Post by cidylong » Wed Jun 17, 2020 1:59 am

The ignition +12v found in my fuse board, number 4.

Tested, works fine.

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erikv11
Posts: 9748
Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850, S/V70, 06 S60R
Location: Iowa
Has thanked: 99 times
Been thanked: 293 times
United States of America
erikv11

Re: Ignition on 12v power in Engine bay

Post by erikv11 » Wed Jun 17, 2020 7:53 am

There are definitely fuse box options, good thinking. Glad you got that part sorted.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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