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torpedo51
Samba Member
Joined: May 19, 2012
Posts: 33
Location: Los Angeles
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 Posted: Tue Aug 01, 2023 11:20 pm Post subject: 1987 Vanagon GL syncro: Fuse 12 short... need approach |
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Hi,
I took my Syncro in to have some work done. The tech lowered the fuse panel. He was startled by a few of the unplugged wires, thinking that they came apart when he lowered the panel (even though its normal to have some of them disconnected) and so he started plugging them in randomly without asking anyone...and now fuse S12 blows every time I insert a fuse.
Fuse S12 controls all of these appliances: rear wiper motor, rear underseat auxiliary heater, power mirrors, and A/C. The power to S12 is fed by the Load Reduction Relay - which I tested and it functions perfectly.
Because there are so many circuits downstream from this one fuse, I'm having a hard time isolating the short. I can't seem to find a convenient "branch" where I can simply remove all 5 circuits and start adding them back until I find the bad one. Any advice? The wiring diagram I found on the Samba is for an 1985, and doesn't quite match my 1987.
Worth noting: the yellow/black power lead with the yellow plastic single connector in the top right of the photo should be connected, but is currently disconnected which makes me think the tech plugged the other end of this connector into something else by mistake, but I don't know what the other end looks like or what this is for. Help?
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50348
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| Posted: Wed Aug 02, 2023 5:47 am Post subject: Re: 1987 Vanagon GL syncro: Fuse 12 short... need approach |
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| You need to scroll down further in the 1985-86 "Vanagon Wiring Book (PDF)" until you reach the book for the 1986 models. This should cover your 1987 fairly well. The Bentley covers the various years in even better detail, and I wouldn't dream of owning a rig this old without one. |
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crazyvwvanman
Samba Member
Joined: January 28, 2008
Posts: 9935
Location: Orbiting San Diego
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| Posted: Wed Aug 02, 2023 7:27 am Post subject: Re: 1987 Vanagon GL syncro: Fuse 12 short... need approach |
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What makes you so sure that yellow connector on black/yellow wire is supposed to be plugged into something?
Why was the tech lowering the panel?
Mark
| torpedo51 wrote: |
.....
Worth noting: the yellow/black power lead with the yellow plastic single connector in the top right of the photo should be connected, but is currently disconnected which makes me think the tech plugged the other end of this connector into something else by mistake, but I don't know what the other end looks like or what this is for. Help?..... |
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MarkWard
Samba Member
Joined: February 09, 2005
Posts: 17153
Location: Retired South Florida
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| Posted: Wed Aug 02, 2023 8:19 am Post subject: Re: 1987 Vanagon GL syncro: Fuse 12 short... need approach |
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Looking at page 97.118. Fuse 12 powers pin G1 that has a black yellow wire supplying power to the front blower switch. It supplies power to pin E8 that is power for the rear window wiper motor. It also suppllies power to pin G3, but that pin shows vacant in the 87.
Your results may vary.
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torpedo51
Samba Member
Joined: May 19, 2012
Posts: 33
Location: Los Angeles
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| Posted: Wed Aug 02, 2023 4:42 pm Post subject: Re: 1987 Vanagon GL syncro: Fuse 12 short... need approach |
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| crazyvwvanman wrote: |
What makes you so sure that yellow connector on black/yellow wire is supposed to be plugged into something?
Why was the tech lowering the panel?
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Because on my wiring diagram, and in a few other posts here, the purpose of this wire is to power the rear auxiliary heater or the power windows. I have both accessories installed in my car. These accessories and the others related to fuse S12 were all working perfectly before I dropped the car off at this shop, and now none of them are working. Seems like perhaps this wire should be connected, and perhaps serves power to all 5 of the accessories that are currently non-op.
The tech was lowering the panel to get behind it for another purpose - not for any electrical work. |
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crazyvwvanman
Samba Member
Joined: January 28, 2008
Posts: 9935
Location: Orbiting San Diego
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| Posted: Wed Aug 02, 2023 5:20 pm Post subject: Re: 1987 Vanagon GL syncro: Fuse 12 short... need approach |
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You said fuse 12 blows every time you insert it.
Those things that use fuse 12 wouldn't be expected to still work with the fuse blown.
Inside that loose yellow connector, what exactly do you see?
Mark |
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torpedo51
Samba Member
Joined: May 19, 2012
Posts: 33
Location: Los Angeles
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| Posted: Wed Aug 02, 2023 6:16 pm Post subject: Re: 1987 Vanagon GL syncro: Fuse 12 short... need approach |
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| crazyvwvanman wrote: |
You said fuse 12 blows every time you insert it.
Those things that use fuse 12 wouldn't be expected to still work with the fuse blown.
Inside that loose yellow connector, what exactly do you see?
Mark |
Its not melted or burned. Im thinking the tech should have connected some wire to this connector, but instead he errantly plugged that other wire into a wrong connector elsewhere that is shorting the circuit on S12.
wanted: Wire W <> BLK/Y
maybe got this: Wire W <> ??? AND BLK/Y <> unconnected |
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torpedo51
Samba Member
Joined: May 19, 2012
Posts: 33
Location: Los Angeles
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| Posted: Fri Aug 04, 2023 2:05 pm Post subject: Re: 1987 Vanagon GL syncro: Fuse 12 short... need approach |
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| MarkWard wrote: |
| Looking at page 97.118. Fuse 12 powers pin G1 that has a black yellow wire supplying power to the front blower switch. It supplies power to pin E8 that is power for the rear window wiper motor. It also suppllies power to pin G3, but that pin shows vacant in the 87. |
Yep - I see that. Something simple was accidentally done that disabled all these and is shorting them all out. It's got to be simple. Something that they all have in common.... ??
From 97.102:
Fuse 12 - Heater fan, rear wiper, cruise control, A/C, outside rear view mirror adjustment . . .. . 20amp
From 97.118, etc:
S12 -> G3: not used (no track)
S12 -> G1 (track 164) warm air blower switch (track 152) linked to ground (track 69) via T7 ground
S12 -> E8 (track 163) rear wiper motor
(track 162) rear window washer/wiper relay (Relay slot 11)
From 97.185:
S12 -> G1 (track 1) power mirrors
From 97.197:
S12 -> G1 (track 1) power windows
I'm not including the A/C diagram, due to complexity, and I don't have cruise control. |
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