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B-12

not the vitimin

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#1 vbrad511

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Posted 19 January 2018 - 06:21 PM

Hey all, I need a little educating. Looking for the physical location of the B12 connector. It's labeled on 8-47 of the FSM as a resistor that ties into the charging circuit. Where would I actually find this on the car?





#2 croquest87

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Posted 19 January 2018 - 06:53 PM

https://imgur.com/7d0rtR3

Here is the link to page 8-47  l would like to know what it looks like myself

#3 croquest87

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Posted 19 January 2018 - 07:03 PM

Will look in some old SOS manuals l downloaded bunch of years back it's very detailed it may be in there somwhere

#4 techboy

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Posted 19 January 2018 - 09:18 PM

Not sure if this it or not, but there's a large resistor mounted on the passenger inner fender right near the air can. Pretty sure it's held in with two screws.

Edit - I lied, its actually right behind the passenger headlight. I was close ...

Edited by techboy, 19 January 2018 - 09:22 PM.

1988 Starion ESi-R ... crushed by a tree 10/31/11 - back from the dead 8/2016
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#5 BuGG

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Posted 19 January 2018 - 09:30 PM

Isn't it on drivers side with the a/c relays.
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#6 ucw458

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Posted 19 January 2018 - 10:06 PM

View Postvbrad511, on 19 January 2018 - 06:21 PM, said:

Hey all, I need a little educating. Looking for the physical location of the B12 connector. It's labeled on 8-47 of the FSM as a resistor that ties into the charging circuit. Where would I actually find this on the car?

B-12 location is listed on page 8-36 in the FSM.  It's behind the drivers side kick panel above the flasher.  The connector has a blue wire and a white with yellow stripe wire.

Coincidentally pages 8-36 and 8-37 are missing from starquestgarage.



View Posttechboy, on 19 January 2018 - 09:18 PM, said:

Not sure if this it or not, but there's a large resistor mounted on the passenger inner fender right near the air can. Pretty sure it's held in with two screws.

Edit - I lied, its actually right behind the passenger headlight. I was close ...

That's the current limiting resistors for the TBI fuel injectors.  That's where the injectors get 12v + from.  Circuit path is battery, ECI fuse link, ECI relay, resistors, injectors.  I have seen the wire between the ECI relay and resistors dead short where it passes through the firewall on more than one car.  When that happens it fries the wire all the way back to the battery.  It happened to Averse's car at TSQ.
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#7 vbrad511

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Posted 19 January 2018 - 10:49 PM

Exactly what I needed. Thanks

#8 croquest87

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Posted 20 January 2018 - 01:31 AM

https://imgur.com/a/u86WA

From SOS files especially for people who like to delete things before reading up what they do check it out

#9 BuGG

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Posted 20 January 2018 - 01:51 AM

View Postcroquest87, on 20 January 2018 - 01:31 AM, said:

https://imgur.com/a/u86WA

From SOS files especially for people who like to delete things before reading up what they do check it out

Yeah this is what I was referring to.
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#10 Preludedude

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Posted 20 January 2018 - 05:54 AM

View Postcroquest87, on 20 January 2018 - 01:31 AM, said:

https://imgur.com/a/u86WA

From SOS files especially for people who like to delete things before reading up what they do check it out

The black box on mine did not have a blue wire & white/yllw wire....So it got cut.  

I keep getting mixed opinions on it.....

And I'm still in the dark....

#11 croquest87

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Posted 20 January 2018 - 06:41 AM

Ucw458  is right about b12  here is that page from electrical manual
https://imgur.com/zmttHsv

As far as my previous post for black box resistor on drivers side by the ac relays that's  a alternator resistor diode  mine was cut to  but it's going back in today

#12 croquest87

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Posted 20 January 2018 - 07:56 AM

I had no issues without that black box resistor diode by the ac relays at least not that l know of  but still would like to know what it is tied into to resist power to ? maybe someone has some proven input on this subject it does sound important though ?

#13 ucw458

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Posted 20 January 2018 - 06:34 PM

View Postcroquest87, on 20 January 2018 - 07:56 AM, said:

I had no issues without that black box resistor diode by the ac relays at least not that l know of  but still would like to know what it is tied into to resist power to ? maybe someone has some proven input on this subject it does sound important though ?


That one on the relay tree is listed on page 8-33 as connector A-28.  As for what it goes to idk.  Unplug it and see what stops working.
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#14 croquest87

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Posted 20 January 2018 - 07:30 PM

It was off for at least for a year all seemed fine  l ended up installing it back in today just in case  maybe something new starts to work  l thought l read somwhere that b12 eventually becomes b28 or a28  l guess little more reading diagrams would help lol

#15 ucw458

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Posted 21 January 2018 - 03:39 AM

I tried scanning through the wiring diagrams for the A-28 connector but that's alot of pages to go through.  There is a B-12 and a B-28 on the charging circuit.  But the "B" connections are in the car and the "A" connections are under the hood.
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#16 BuGG

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Posted 21 January 2018 - 11:52 AM

You guys take a look in the 89 electrical book?  A lot of these connectors/relays changed.  The Diode that I was referring to in post #5 at the A/C relay tree is A-27 and is shown in the charging circuit on page 8-47.

Its listed as B-12 in the 88 book and A-27 in the 89 book.  In 88 it is located at the same place (A/C Relay Tree) and with the same wire color as 89.  I think they corrected it in 89 because as ucw states B connections are in cabin and A connections are in engine bay.

Edited by BuGG, 21 January 2018 - 12:11 PM.

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#17 croquest87

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Posted 21 January 2018 - 12:09 PM

Picture of the diagram? Mine is 87 but have 88 complete tree so l took the black box wiring plug and wires which are blue and white yellow and they are identical to my 87    one thing l noticed that the wiring for theft alarm relay has same relay but extra wire and diferent colors wiring

#18 BuGG

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Posted 21 January 2018 - 01:42 PM

View Postcroquest87, on 21 January 2018 - 12:09 PM, said:

Picture of the diagram? Mine is 87 but have 88 complete tree so l took the black box wiring plug and wires which are blue and white yellow and they are identical to my 87 one thing l noticed that the wiring for theft alarm relay has same relay but extra wire and diferent colors wiring

The theft alarm horn relay is different in 88 and 89.  It is located at the A/C relay tree in 88 and looks like a common relay.  In 89 the Defogger relay is in that spot and is noticeably different.  It has thicker wires and relay is another type.  They moved theft alarm horn relay in 89 to behind the black shield near battery.
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#19 BuGG

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Posted 21 January 2018 - 01:50 PM

View Postcroquest87, on 20 January 2018 - 07:30 PM, said:

It was off for at least for a year all seemed fine  l ended up installing it back in today just in case  maybe something new starts to work  l thought l read somwhere that b12 eventually becomes b28 or a28  l guess little more reading diagrams would help lol

This Diode at the relay tree runs inline with the "L" wire that is in the 2 wire plug at the alternator if that helps.  I think its connected inline with ignition switch.  So a diode is used to allow current to pass one direction and prevent it from going opposite direction.  So maybe it prevents you from frying your ignition.

This is on 8-109 in the 89 manual.

If you have the 88 manual take a look at page 8-115.  It shows a slighly different schematic than the 89 manual.  In the 89 they give more detail.

Edited by BuGG, 21 January 2018 - 01:55 PM.

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#20 croquest87

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Posted 21 January 2018 - 01:53 PM

Thats good info       Good to know  when i start working on my 88 and 89   man they changed quite a few things in a short period of time  gets confusing real quick if you dont pay close attention




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