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Old 09-24-2019, 04:12 PM   #1
itlksez
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Default '87 740 Wiring Identification

I'm putting a wiring harness back together after too many years to remember where everything came from. Shame on me for not labeling things better. Any help would be greatly appreciated.

What does this go to? It's up in the vicinity of the DS fender.



And... The wires from the fuel tank are on top. I have two clips in this area that match. Which one is it? I'm assuming the one on the right because of the three wires, but the color change has me guessing:

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Old 09-24-2019, 09:28 PM   #2
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On my 85 pink was for fuel pumps. I’m pretty sure the black and yellow are lights.
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Old 09-25-2019, 01:17 AM   #3
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Thanks!

Anybody have any ideas about the top pic? If I get time tomorrow, I’ll hook power to the harness and start testing.
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Old 09-25-2019, 03:07 AM   #4
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I've had a quick look through the wiring diagram and the only violet wire I see going through the connector on the DS left engine side is for the brake fluid level sensor. Maybe that's it?

Page 8 for the connector (pin 19) and pages 80/81 for the ABS circuit.
http://borich.lesnoe.spb.ru/auto/Vol...20Diagrams.pdf
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Old 09-25-2019, 08:38 AM   #5
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Wow, thanks for the link. That’s a huge help. I’ll dig into this shortly and report back.
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Old 09-25-2019, 01:22 PM   #6
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Got it to crank! Have spark and fuel, but my pump is leaking so badly, I don’t think it’s building enough pressure to fire. A new pump will be here tomorrow.
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Old 10-04-2019, 10:20 AM   #7
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How about this one? Blue and brown, has its own junction.

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Old 10-04-2019, 02:39 PM   #8
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Isn't that the one that connects to the wires running down to the battery tray temperature sensor?
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Old 10-04-2019, 06:07 PM   #9
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Quote:
Originally Posted by tintintin View Post
Isn't that the one that connects to the wires running down to the battery tray temperature sensor?
That's exactly what matches the plug and wire colours in the wiring diagram.
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Old 10-04-2019, 09:54 PM   #10
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Ok, I’m glad I asked. That required some googling; I had no idea such a thing even existed.

Does the alternator/ECU need that to function? Will it fry my battery without it?

Thanks guys. Sorry for the stupid questions. I’m still getting the hang of the wiring diagrams.
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Old 10-05-2019, 12:37 AM   #11
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Use a meter set to ohms and a wiring diagram.
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