I was reading Tracy's EC2Ainstallation guide pdf
and ran across this illustration of the back side of
a DB37 male connector on page 20 and on page 25 of the
EC2 manual. Then I checked the position of pin
1 on the female mating connector on top of the EC2.
Opps!!! Something did not look right.

Pin 1 was actually on the left on the EC2 and it was on
the right in the illustration. In any even I changed the
illustration and here is the corrected version.

Might seem like a minor point to us old sparkies but
a newbe might be more confused than he is already :)

Paul Lamar


 Be VERY sure you are correct about this.Literally hundreds have been
 built according to these instructions and no one has had a reversed
 wiring problem.  Note which side of the connector is referenced in the
 drawing.

 Tracy

 That is not what I am saying. Both will wire correctly.

 My point is the illustration in the EC2 manual is disorienting.

 I have looked at  the EC2 PC board and the ground pins 19 & 37
 are on the right looking down on the EC.

 My corrected illustration also has the ground pins  19 & 37 on the right
 when the mating male connector is plugged in and you are looking down on
 top of the EC. If you  rotate your illustration 180 degrees to orient
 it the same as the connector on the EC it would be clearer. That is what
 I did and re wrote the numbers so they are right side up.

 Am I wrong about 19 & 37 being on the right side of the connector
 looking down on the EC2?

 IMHO it would help if you labeled the pin numbers on the top
 of the EC2.

 Paul Lamar


 Without looking, I was under the impression that the illustration
 showed the mirror image or the other connector.  I am not sure which
 is illustrated, but in would be on one side of the connection and
 the other of the connector, thus placing the number one pin, et al,
 on one side looking at its "front" and on the other looking at its
 back.  Made sense to me at the time......

 Chris
 Houston

 The male D-sub min connector will only mate with the female
 D-sub min one way.

 Here are both illustrations.
 Which do you prefer?

 Paul Lamar


I see what you're saying but don't understand why you would be looking
at the EC2  while wiring the connector.  Wire the connector according to
the drawing ( either one )  and you don't need to ever look at the
numbers on the EC2.  I would think dividing your attention between the
two would only confuse builders.

Tracy

Well I am taking it a step beyond just wiring the connector.
I want to make it intuitively clear exactly what is going on
and what goes where.

I am organizing things in separate wiring harnesses according to
function.
This makes it easier to understand and  deal with as each harness can
be done one at a time. One simple step at a time.

I have broken the job down to 5 harnesses. Starter alternator harness,
Sensor harness, Injector harness, Coil harness and PCM harness. Since it
is hard to get wires in more than about 4 or five colors this makes the
job much easier. I have located some 12 wire color coded vinyl jacket
cable for the PCM harness.

Since I am using the the terminal strip break outs for the D sub min
connectors on the EC2 and PCM  It cuts the job down to one or two days
for the whole thing. It is also a lot neater and easier to trouble shoot
and fix wiring mistakes.

I will reveal the new invention next week when the prototype
is done :)

I have two buses on the top of the engine to feed
power and ground to the coils and power to the injectors.
The test switches are not implemented on this go around.
Here is a picture. The goal is a visual inspection capability.

BTW I bought Mike's RV4 so I will probably rewire that too.

I am also working on a heat sink for the RX8 coils.
Do you have a source for RX8 coil connectors?
I need at least 8.

Paul Lamar


Is that Mike Will's RV4 w/13B?
I thought that ended up in MN?
The new owner was looking to part out
the engine installation.
Cheers
Cary

Dave Leonard and others talked him out of it.
I helped of course :)
Yes unfortunately it is in MN. Dave kindly volunteered
to fly it back. I am considering how to get
it back when the snow melts.

Paul Lamar