1990 D350 Service Trim - No computer - Never computer?!? - Dodge Cummins Diesel Forum
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post #1 of 3 (permalink) Old 06-24-2018, 07:09 PM Thread Starter
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1990 D350 Service Trim - No computer - Never computer?!?

Hey all,

I have a brand new (to me) 1990 D350 service trim and it has a mess of cable on the inside. Even the stock cables and tape are degraded. I plan on going over it inch by inch and remaking the cables.

I have one small problem, there is no ECM/ECU/PMS/BBQ unit. No computer. No brain.

This vehicle used to be a CALTRANS vehicle and they have a fleet with a hundred thousand cars or so, so I would not put it past their very capable mechanics to bypass the computer, but I also imagine that service trim trucks might have been behind the curve to come equipped with computers.

So I defer to you.

Has anyone encountered ~1990 trucks without computers and where would the wiring be documented?

Here are all the documents I have found online. None of them were from behind a paywall (that I am aware.)

Link obscured because this is my first post.
goo.gl/Qhcewo

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post #2 of 3 (permalink) Old 08-27-2018, 09:46 PM
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I'm currently rewiring my truck to delete the pcm, all that would control (if your truck has it all) a/c, cruise control, abs, heater grid, speedometer, voltage regulator. I'm sure more stuff goes through it like probably the fuel cutoff switch and other sensors, but like most trucks of this age majority of the wiring is a rats nest. Running without the pcm means the fuel cutoff is either now a manual one, or wired to the key, the speedometer is ran straight from the speed sensor on the transmission, heater grid is on a push button or not hooked up at all. Then the alternator would be hooked up to an external voltage regulator before going to the battery
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post #3 of 3 (permalink) Old 01-21-2019, 03:41 PM
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Quote:
Originally Posted by Corey Xolt View Post
Hey all,

I have a brand new (to me) 1990 D350 service trim and it has a mess of cable on the inside. Even the stock cables and tape are degraded. I plan on going over it inch by inch and remaking the cables.

I have one small problem, there is no ECM/ECU/PMS/BBQ unit. No computer. No brain.

This vehicle used to be a CALTRANS vehicle and they have a fleet with a hundred thousand cars or so, so I would not put it past their very capable mechanics to bypass the computer, but I also imagine that service trim trucks might have been behind the curve to come equipped with computers.

So I defer to you.

Has anyone encountered ~1990 trucks without computers and where would the wiring be documented?

Here are all the documents I have found online. None of them were from behind a paywall (that I am aware.)

Link obscured because this is my first post.
goo.gl/Qhcewo
Your lucky the 90's don't have a computer, all they do is cause problems on the newer 12v's that do have them. Also you'll have more luck in getting help by posting in the 1st Gen section.

84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter

96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired
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