Need wiring harness help. 1.9L Vanagon

[kg0483]

Hello, I have a 1984 1.9L Vanagon with a wiring harness that has seen better days. I purchased a new used harness off of ebay as a replacement. My problem is this new harness looks 90% correct except where it connects to the full throttle enrichment switch and idle switch on top of the throttle body. The 4 female spade type connectors are missing. Do I have the wrong harness? The seller said it was for an 84. How does the wiring to these switches connect to the computer? Are the spliced into the main harness or are the separate? I don't want to take off my old wiring harness to investigate because the van is my daily driver. Thanks in advance for any help.
-Kyle

[crazyvwvanman]

You may have received a later 85 harness with uses a single throttle body switch. Both types have only 2 actual wires for the switch(es) but earlier ones split them off for 2 distinct switches. You can make it work if that is what you received.

Mark

[pomfritz]

GW maybe able to help with making that work. The description for their new throttle body says it is for the single switch years but a dual switch can be modified to work.
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83.5 233K. GW 2.3, SS exhaust, My German Frau named her Stefi

[vanlover22]

I have an 83.5 with the two switches on the throttle body. The full throttle enrichment switch and the idle switch go to the same pin on the ECU and I believe they are just teed off near where the connectors are. On later models they combined the switches mechanically into one switch on the throttle body. You can tee off the two connections and make them into four connections.
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83.5 Vanagon 1.9L Automatic
Country Homes Camper
Engel Fridge w/Solar

[kg0483]

From the looks of the harness I think I can make it work. Thanks for the good news guys.

[t3 kopf]

One wire is ground and one wire goes to the ecu. snip both wires at the connector, set them up so that both wires have 2 1/4" female spade connectors. This will make you have 1 ground wire with 2 spades and 1 ECU send wire 2 spades. hook 2 grounds to one side of both switches and 2 sends to the other side of both switches. Take a look at your old harness for reference.
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'90 Carat w/ '95 phase 1 EJ22 OBD2 conversion

[binger59]

So if I’m going the other way from the 4 connection switch to the 2 connection can I just combine the 2 left wires and the 2 right wires together? I’m going the GW throttle body route.
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Binger

1984 Westy
1986 7 Pass R.I.P. Donor van
2019 Jetta
2014 Passat
2019 Atlas
2006 Passat R.I.P.
1998 Jetta R.I.P.
1984 Vanagon R.I.P.

[vanlover22]

binger59, You would only need to connect one pair of the wires. On each switch, one of the wires goes to ground, and one of the wires goes to pin 4 on the ECU. On my harness, you can see where they tee off. You could connect one pair of the wires or modify the harness to just have two connections, one to ground and one to pin 4, and put new connectors on to ensure a good clean connection.
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83.5 Vanagon 1.9L Automatic
Country Homes Camper
Engel Fridge w/Solar

[Pascal]

[binger59]

Pascal yes I posted about it in another thread.

https://www.thesamba.com/vw/forum/viewtopic.php?p=8620103&highlight=#8620103
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Binger

1984 Westy
1986 7 Pass R.I.P. Donor van
2019 Jetta
2014 Passat
2019 Atlas
2006 Passat R.I.P.
1998 Jetta R.I.P.
1984 Vanagon R.I.P.

[binger59]

Took a close look at an old harness and the splice is pretty straight forward like everyone said. Last question. New GW TPS, blue wire ground and black wire positive or the opposite?
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Binger

1984 Westy
1986 7 Pass R.I.P. Donor van
2019 Jetta
2014 Passat
2019 Atlas
2006 Passat R.I.P.
1998 Jetta R.I.P.
1984 Vanagon R.I.P.

[Pascal]

I don't think it matters for that circuit.
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'84 Westy - 2.2wbx, GT Torque-Biasing Differential
'91 EA Cabby

[vanlover22]

Pascal is correct, it is just a switch that connects the two wires together (signal to ground), so it doesn't matter which way you connect it. But I would put the ground wire to black, to stick with automotive convention.
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83.5 Vanagon 1.9L Automatic
Country Homes Camper
Engel Fridge w/Solar