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Most fuel pumps will easily self prime with diesel. With winter gasoline at summer temperature, especially with a carburator, you can have vapor lock with an electric pump. A bypass type fuel pressure regulator which reduces pressure by returning fuel to the tank primes easily and stops all...

Nice. NV4500?

The onboard air system in my M1031 SECM started leaking overnight. Pumped it up and sprayed fittings with soapy water. Both input flare fitting and the output Milton coupler were leaking. Replaced the coupler and tightened the flare fittings. Figured it was a good time to check tire...

I ran cables under the floor mat, through existing hole in the floor with a grommet. Routed to the right side of the box, there was an existing hole for the communication gear in the right front compartment. From there, it goes through existing channel for box lighting to the center rear...

In case you needed an image.

Needed on on my M1031 since the aluminum is not transparent ;) I made a mounting box from 1/4" MDF, rounded it to match the face plate of the display and mounted it on the radio rack. Rear camera is mounted to the center clearance light, not much for hitching but very good for driving and...

Flush with clean mineral spirits, then plug or cap all openings. Seal in double bags.

The negative is isolated from the case, unlike most other alternators. So if the tech didn't bond the negative to the case, the alternators would fail the test.

Ok, sounds like exciter circuit problems on both alternators. You need to trace the wires from engine side to the generator lights in the dash. The light bulbs must illuminate with key on, engine off. The current illuminating the bulbs bootstraps each alternator, providing current to the...

Keep the old injection pump if it was running. You may need it.

Original 27SI alternators have 4 required connections. These are battery positive, battery negative, voltage sense and exciter-trouble light. On the driver side alternator, there is a brown wire that presses on a 3/32" smooth stud, about 5/16" long. This is for tachometer reading using...

11.8 volts is very weak. Both need to be 12.5 volts or more. 650 CCA is also weak. Test alternators per the sticky thread at the top of this forum, then load test batteries after a full charge.

Good to hear you got it together and working. Now insulate all exposed 12 volt connections and you should be good.

That circuit breaker will be perfect.

What are you planning on running? 1000 Watt inverter will draw over 80 amperes. That is #4. I would go with a circuit breaker over a fusible link because that is a lot of molten metal to capture in the silicone rubber jacket of a #8 fusible link. Yes, the alternators are wired with #6 and...

That would work too. It will draw off the front battery since this is also where the rest of the truck gets 12 volts for lights, fan, wipers etc. I run a lot of 12 volt loads off the rear battery, just to split alternator loads. And interior lights on the SECM box are series pairs of 12...

That diamond shaped power terminal on the driver side of the firewall is quite limited in power, I would not recommend applying any more load to it. The stock M1009 communications kit had two #4 wires to it, one is 24 volt #4 from the top bus bar and should be red. The other is a black #4 and...

You want 12 volts to the communication power on the rear passenger side of the M1009? Because restoring the under hood to stock made it 24 volts? Easy as running a #4 wire from the back battery negative to the rear communications power bars. Color code it red with black. Now you have access...

So now you need to check the starter to make sure of voltage. A 24 volt will not fling the pinion and make starter motor engage on 12 volts. A 12 volt on 24 volts won't last long. 24 volt starters draw half the current as equal 12 volt. So if the prior owner did a 12 volt conversion, you...

You have the root cause identified. The prior owner cut the 24 volt bus to 4 terminals, using the 5th terminal to "make" a 12 volt. Why? Probably for a 12 volt conversion. 24 volt starters are available as well as 27SI isolated negative alternators. My bad luck with local auto parts...