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Yellow accessory connector wiring options

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

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SonicAdventure
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Yellow accessory connector wiring options

Post by SonicAdventure » Sat Jun 20, 2020 5:34 pm

Hi all, I’ve used the driver side yellow accessory connector in the past. For my CB in the V70, I used connector #1 which was supposedly a 30-amp circuit. It was constant hot, that much I know for sure.

I know that #8 is a ground connection. I’ve searched around for what connectors 2-7 are and some diagrams show several of them as 1-amp circuits and one as “X-supply”.

I’m trying to wire a 12 volt socket for charging phones into the 850. I know I could use connector #1, but I’m not sure I want a phone charger wired to a constant hot circuit. Which of the other connectors would be good for a 12 volt power circuit and what are the other connectors fused at?

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Re: Yellow accessory connector wiring options

Post by BEJinFbk » Sat Jun 20, 2020 8:44 pm

X-Overload is your switched output.
It's probably a good idea to use it to
energize a relay to pick up constant.

Probably also a good plan to fuse everything.
Accessory Connector - 5 Wire.jpg
Accessory Connector - 5 Wire.jpg (52.21 KiB) Viewed 163 times
96 850 AccConn Diagram.pdf
(267.12 KiB) Downloaded 11 times
1998 P80 AccConn.pdf
(371.6 KiB) Downloaded 4 times
Last edited by BEJinFbk on Sun Jun 21, 2020 12:38 am, edited 1 time in total.
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Re: Yellow accessory connector wiring options

Post by SonicAdventure » Sat Jun 20, 2020 8:57 pm

BEJinFbk wrote:
Sat Jun 20, 2020 8:44 pm
X-Overload is your switched output.
I't's probably a good idea to use it to
energize a relay to pick up constant.

Probably also a good plan to fuse everything.

Accessory Connector - 5 Wire.jpg
96 850 AccConn Diagram.pdf
1998 P80 AccConn.pdf
Ok so looking at this diagram, connector #2 is hot in ACC or Run and has a 10-amp fuse. I’m thinking this would be the best option, as the other switched one is only hot when high beams are on.

If #2 has a 10-amp fuse for one 12volt power adaptor, would I still need another one in line? Most cigarette lighters use a 15amp fuse, would 10amp for a power socket be too low, as in blowing all the time? What if I put a 15 amp in the fuse panel in its place and didn’t use an in line fuse?

If using this Yellow accessory Plug isn’t the best method for a 12volt charging plug, where would be the next best place to tap into an ACC/Run switched circuit? I see the plug adaptor for the “Info” switch is right next to where I’m putting the 12volt socket. I have the regular gauge cluster and no plans to upgrade to the Info one. Could I just tap into that hot and ground?

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Re: Yellow accessory connector wiring options

Post by abscate » Sun Jun 21, 2020 12:40 am

Has anyone found the matching plug to the accessory plug provided by Volvo? I would love that.

An X circuit Is a switched hot 12 V supply in key pos II , not sure about I, which is also switched off during kP III ( starter cranking). Perfect for a phone charger
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Re: Yellow accessory connector wiring options

Post by BEJinFbk » Sun Jun 21, 2020 12:41 am

If it were me, I’d use 2 to trigger a relay
that supplies power from constant, then
fuse the relay’s output. Value? Dealer’s
choice, but 15 would be fine.
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Re: Yellow accessory connector wiring options

Post by BEJinFbk » Sun Jun 21, 2020 12:47 am

They have to be out there. maybe cut down
a connector with a higher pin count? If nothing
else, pins from other connectors should fit.
Just remove them from another shell. A little
heatshrink, fold it back and ty-wrap it off to
the acc conn harness and you have a pretty
solid and reversible connection.
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Re: Yellow accessory connector wiring options

Post by SonicAdventure » Sun Jun 21, 2020 8:03 am

abscate wrote:
Sun Jun 21, 2020 12:40 am
Has anyone found the matching plug to the accessory plug provided by Volvo? I would love that.

An X circuit Is a switched hot 12 V supply in key pos II , not sure about I, which is also switched off during kP III ( starter cranking). Perfect for a phone charger
Thanks Abscate. When you say “matching plug” are you referring to just the removable part of the yellow accessory connector? I think that would have to be a junkyard item. Or are you talking about a yellow accessory plug with all 8 pins installed and several inches of wire attached to them, similar to a wiring harness you can buy for an aftermarket radio?

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Re: Yellow accessory connector wiring options

Post by SonicAdventure » Sun Jun 21, 2020 8:08 am

BEJinFbk wrote:
Sun Jun 21, 2020 12:47 am
They have to be out there. maybe cut down
a connector with a higher pin count? If nothing
else, pins from other connectors should fit.
Just remove them from another shell. A little
heatshrink, fold it back and ty-wrap it off to
the acc conn harness and you have a pretty
solid and reversible connection.
Thanks for all your advice, BEJ. When I wired my CB in the last car, I just wired it straight to #1, and then grounded to the body it a few inches from the radio by attaching a lug to one of the bolts that held the knee bolster in place. I never had any trouble with that set up, never blew any fuses.

I like the idea of adding a relay and an inline fuse, but I’m not sure it’s worth all the trouble. Why do you think those additional steps are needed?

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Re: Yellow accessory connector wiring options

Post by abscate » Sun Jun 21, 2020 1:27 pm

I would like a plug that mates with the yellow open plug under the dash, with pigtailed wires ideally

I didn’t find enough info on the plug to find a mating one
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Re: Yellow accessory connector wiring options

Post by erikv11 » Sun Jun 21, 2020 1:40 pm

abscate wrote:
Sun Jun 21, 2020 1:27 pm
I would like a plug that mates with the yellow open plug under the dash, with pigtailed wires ideally

I didn’t find enough info on the plug to find a mating one
You want this:
1086014883_pluggyplug.jpg.ceb551e32a8010174d182436a06cce6a.jpg
accessory connector mate
1086014883_pluggyplug.jpg.ceb551e32a8010174d182436a06cce6a.jpg (127.79 KiB) Viewed 83 times
Available from VSer John Van Cleave (I think he's just jvc there), he figured it out ...

https://www.instagram.com/jvc8790/?hl=en
https://www.facebook.com/jvc8790
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'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
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'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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