[Gmecm] Putting the computer in the engine compartment?

[mark krawczuk]

hi,  what about using silicone to seal ?

mark  k

----- Original Message ----- 
From: "David Allen" <davida1 at hiwaay.net>
To: <gmecm at diy-efi.org>
Sent: Saturday, 26 November 2005 3:31 AM
Subject: Re: [Gmecm] Putting the computer in the engine compartment?


>
>> Hi there!
>>
>> The problem isn't heat -- it's water.  Water will want to travel along
>> every seam, opening, and will migrate along the wiring harness.  Sealing
>> the ECM from water is the chore.
>
>  Yes, I learned that the hard way.  My first attempt at a boat ECM box had
> the wires going under a notch in the lid.  It filled with water and 
> wrecked
> the ECM.  Then I built this setup.
>  It was easy to install the Deutsch connectors.  Just clip the ECM harness
> one wire at a time and insert each wire in the respective connector one at 
> a
> time. The holes in the connectors are labelled on each side.  Once again, 
> if
> anyony wants info I have part numbers and info on obtaining these 
> connectors
> from AGCO/ Caterpillar dealers.  I don't sell connectors and I don't have
> prices; but I do have part numbers with pictures for 12, 23, and 40-pin
> watertight bulkhead connectors, terminals, wire seals, and locks.
>  On my boat, one of the harnesses is battery and ground, ignition switched
> power, fuel pumps, ALDL, and other things that are not on top of the 
> engine.
>  The other connector is the temp sensor,  MAP sensor, HEI ignition timing,
> and all throttle-body components.
>  There were enough unused pins in the 2 connectors that I was able to
> design it so if the 2 are switched, the battery power feed will not be
> connected to anything if the battery/ ground harness is accidentally
> connected to the TBI harness plug.
>  Another good box option is a military metal ammo box.  Those things are
> thin-gauge steel, completely watertight and easy to open.  You could have
> the ECM and relays in one of those and install watertight connectors 
> through
> the box.  It would look better underhood than a Carlon plastic box and
> probably be more durable. I used a plastic box on the boat to avoid 
> exterior
> rusting. You know- since it is guranteed to be sitting in water from time 
> to
> time!
> David
>
>
>
>
>>
>> David's box is a good example of what to do -- notice the wiring is
>> through weatherproof connectors. That is the key -- it's easy to get the
>> ECM in a waterproof box, but sealing the wiring's another issue.
>> Installing weatherproof connectors in the box, and running wiring from
>> the connectors to the ECM is the right answer.
>>
>> Jay Vessels
>> 1982 Chevrolet S-10 Sport, 2.8V6 TBI
>> 1984 Chevrolet S-10 Blazer Sport, 2.8V6 (TBI pending)
>
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