Date: Mon, 14 Jan 2013 18:39:45 -0800
Reply-To: John Reynolds <transporterjr@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: John Reynolds <transporterjr@YAHOO.COM>
Subject: Re: Help me read a wiring diagram
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Dave,
Thanks. I have an early 86 (10/85) and before the 055689 vin on pg 97.99 for the later production. However, I did not realize there were 2 diagrams for the 86 - so thanks for avoiding a possible future headache!
On the mystery ground, I took my meter across the Brown wire at the under-seat rear heater (T4a) connector and ground behind the ECU - guess what I get resistance, so it is the same wire! VW took the long route??
Therefore it appears that the T4a connector as shown in the brown ground wire on the late 86 diagram (pg 97.99), should have been shown the same way on the early (pg 97.82) diagram.
Tomorrow, I am copying all the diagrams for my early 86. Adding lines a few lines and the connector and can keep it in the van for easier reference then thumbing through all the years finding the appropriate pages.
(PS- thanks to Neil too!)
Happy trails!John
--- On Sat, 1/12/13, David Beierl <dbeierl@attglobal.net> wrote:
From: David Beierl <dbeierl@attglobal.net>
Subject: Re: Help me read a wiring diagram
To: "John Reynolds" <transporterjr@YAHOO.COM>
Cc: vanagon@GERRY.VANAGON.COM
Date: Saturday, January 12, 2013, 9:57 PM
Hi John,
First, you're reading the diagram page for early '86, just making sure you know that. Late '86 is on 97.99
At 05:16 PM 1/12/2013, John Reynolds wrote:
> OK - for rear heater - 1986 van. Trying to figure out Bentley page 97.82 Correct me anywhere I am wrong Power from fuse #14 (20 amp) - feeds through 1.5mm black/yellow wire to dash switch with light.
Correct.
The light is completely separate - there's a callout tag to track 80 where you see it shown as one of the feeds from the panel dimmer.
> From switch to 4-wire (T4a) rear connector under back seat. I can see that full power through yellow wire (max speed 3) - makes sensePartial power through low switch #1 via series resistor.
> OK questions - 1) Speed #2 Y/BK wire shows it going to nowhere. It seems that it would have to go to the series resistor (to the mid-point of 2 resistors) - correct? Why would it not be shown this way?
Drawing error. They should have extended the heavy line and brought the connection dot over to touch the thin line inside the resistor outline. Notice they made the same mistake for the front blower. In case you'd forgotten, heavy lines are wires and thin lines are internal connections in a component or assembly.
> 2) The under seat connector has 4 wires - the 3 shown to T4a and a brown. Yet the diagram does not show brown from/to T4a? 3) Brown from heater fan goes to ground #6 in diagram - which is listed as under the rear seat. I happened to pull the ECU today and there is a ground, but it appears to be used only by the ECU. Does this ground run all way up front - perhaps through switch? I can't imagine the running this wire under the van and around and back in to a single ground behind the ECU instead on a few inches in side the van or having the ground behind the heater instead,
Based on this I think you're looking at a late '86 where the ECU has one of its grounds nearby instead of back in the engine room, and the heater ground goes through T4a and is then called out to track 66 where it goes to ground 15 under the ignition coil. 97.99 tracks 148-9. However in this case the power is called out to track 161 on fuse S12.
Yours,
David
