Date: Wed, 6 Feb 2013 15:00:36 -0800
Reply-To: neil n <musomuso@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: neil n <musomuso@GMAIL.COM>
Subject: Re: No Start Cause: Relay Failure. PICS, Thoughts.
In-Reply-To: <5112DD6D.4080206@turbovans.com>
Content-Type: text/plain; charset=ISO-8859-1
Yah, this was, and is, my first ever swap and foray into automotive
electrical work.
I had the foresight to shrink wrap around the terminals on the wires
or use insulated terminals. However. Hindsight is 20/20.
The real problem at the time was:
A. sourcing terminals that push lock into a relay socket
B. the OEM fuel pump relay has larger than normal male spades and one
really small spade.
I had the offending relay mounted in a socket at one point. I don't
know why I changed that. Likely due to reason "A".
The Jetta fuel pump relay is for sure energized by a supplied negative
from the ECU. Oddly, the Bentley diagram for the power supply relay
shows 30 going to 85 but the fuel pump relay shows 30 going to 86.
If the OEM fuel pump and power supply relays each use a diode as a
suppression device, I have to wonder about the polarity of this
component in each relay given the differences as shown in the Bentley
diagrams.
Neil.
On Wed, Feb 6, 2013 at 2:47 PM, Scott Daniel - Turbovans
<scottdaniel@turbovans.com> wrote:
> no kidding not using a relay socket is a bad idea.
> Like I like to say in engine conversion work ..'do what the manufacturers
> do' ...and they use relay sockets only, to connect to relay pins.
>
> lol ..'the worst' looking mickey mouse stuff I see is individual wires on
> replay pins with some electrical tape ..
> that always just falls off.
> Shrinkable tubing and liquid electrical tape as needed is 5 times better.
>
> What is a 'wall wart" anyway .?
> Every EFI system ECU I have ever seen energizes the fuel pump relay by
> supplying ground to it. It's the common strategy.
> On 2/6/2013 2:19 PM, neil n wrote:
>
> On Wed, Feb 6, 2013 at 1:00 PM, David Beierl <dbeierl@attglobal.net> wrote:
>
> At 03:12 PM 2/6/2013, neil n wrote:
> Not sure if VW wanted to save money on wire, and in the process make
> sure owners would have to purchase a "special" relays, but the 109 is
> obviously wired from 30 to one side of the coil, so only 3 external
> connections required. The fuel pump relay is similar. Diagram image:
> (ignore my annotations):
>
> https://lh5.googleusercontent.com/-qjVqWgmKgiA/UQLzz0KnCHI/AAAAAAAAGq8/dV79PgDqWQg/s720/ABA%2520swap%2520coil%2520wire%253F.jpg
>
> I wired in an external jumper lead from 30 to 86 of relay. It has worked
> fine.
--
Neil n
65 kb image Myford Ready For Assembly http://tinyurl.com/64sx4rp
'88 Slate Blue Westy to be named.
'81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/
Vanagon VAG Gas I4/VR Swap Google Group:
http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines
