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An electrical fusible link is a type of electrical fuse that is constructed simply with a short piece of wire typically four American wire gauge sizes smaller than the wire that is being protected. For example, an AWG 16 fusible link might be used to protect AWG 12 wiring. Electrical fusible links are common in high-current automotive applications. The wire in an electrical fusible link is encased in high-temperature fire-resistant insulation to reduce hazards when the wire melts. Wikipedia

It looks like the connector and the ground wires at the right battery was recycled and used for the left side ground.

Start here. Try this or the fast way

Was this test done with the key in the on position or off position? If it was done in the off position the light blue (LTBLU) and black with white stripe (BLK/WHT) should not have any power (12V) to them.

It's not the fuel boss causing this problem. P1689 no communication between ECM and VP44 The same thing happened to my truck when the VP44 failed just north of Riggens, ID. It was running, died, started ran then died. Me and @Mopar1973Manreplaced it with a pump from DAP. All has been well since. Check your connections and wiring between the VP44 and ECM. If they are OK then the electronics in the VP44 may be bad. By the way I don't use the electric pump when starting, I have the fuse for it pulled and I have it on a relay .

@Marcus2000monstergood to hear you got it done. Fingers crossed here. If you got good weld penetration it should hold.

You will be eliminating the lock up clutch in the torque converter from the situation' The PCM will still be receiving speed signal from the VSS and in control of the governor solenoid. No , if the VSS was "feeding bad info" The shift points would be of or with no info It would not shift at all. This is not part of the test.

It's a secondary air injection, SMOG, pump check valve. It's used to keep exhaust gas from flowing back to the air injection pump. When the valve fails the exhaust gas in an on demand pump will flow back and overtime ruin the pump.

@notlimah this is to unlock the torque convertor after the PCM commands it locked and the vibration starts This function is the opposite of what a lock up switch does.

No, some people like the turbo sound with the ring left out. Why not start with just a resonator and if still to loud add a muffler.

Higher line pressure means stronger clutch holding power so yes there should be a good lock up. The down side to higher line pressure is a chance of seal/O-ring/gasket leakage. A triple disk converter should have higher line pressure to handle higher torque loads This should be accomplished by the shift kit/valve body mods. Yes. This is the ground wire for the overdrive lock up solenoid and only controls the overdrive lock up. No. This will only open and close the torque converter lock up solenoid ground circuit. No. I don't think that will help. The TV cable can change shift points by changing throttle pressure on the shift valve that the governor pressure has to over come. The transmission output speed sensor sends road speed info to the PCM which sends a duty cycle signal to the governor solenoid. The governor solenoid, by opening and closing, controls pressure to the shift valves. Leave that relay alone, don't remove it.

I replaced mine in September. Printed on the bottom of the thermostat is CALTHERM 190F 3935824 9-99 DOWN so It's a 190°F. I purchased a new thermostat from the Cummins dealer. Part number 3946849, cost $43.99

YES Plug at the ignition switch Battery voltage at: RED, PINK and PINK/BLACK wires. All other wires at switch should have no voltage. Another way to test the system for this type of fault is with an amp draw test. If you don't know how to do an amp draw test YOUTUBE has several videos on how to do this.

Glade to hear that you're bringing it back to a respectable condition. Pictures if you would please. We like to see the transformations.

How about placing a small bottle jack to the bottom side of the mount to help persuade it up.

Ran mine to the dimmer switch and a switched 12 volt source. I can't remember which wire, it was a long time ago. I like to dim the dash lights and gauges for better vision when night driving.

Start with checking stray AC voltage out put from alternator. Then think about doing this.

Weld in a stud then use a nut and washer to hold the sway bar bracket in place. The new bolt I see there is not metric but grade 5 standard.

I think you have low line pressure at that speed/RPM to fully engage the torque convertor clutch which may be caused by a weak pump or fluid bypassing from a poor internal seal/gasket, a bad overdrive piston retainer bleed orifice, or overdrive solenoid and check ball. A full pressure test is in order for a better diagnostic of the transmission rather than a ride around the block, kick the tires and send you on your way. A cheap and easy way to test if it is the transmission is to install a switch in the solenoid grounding wire. This is the orange/black wire at the B connector, terminal 11 of the PCM. You must be able to operate the switch inside the cab. Test drive the truck and when the problem occurs turn the switch to off. This will open circuit the ground causing the O/D solenoid to open and unlock the torque convertor clutch. If, at that moment, the shaking stops then you know it's in the transmission.

Idle at 16-17 and wide open is 14 at best. Your results may be different with a big line kit and a draw straw installed in the tank.

That's with factory tank pickup and 3/8" fuel lines.

That's an Airtex E7153 pump repackaged for NAPA. I have one as a backup to my Fuel Boss. It's hard press to produce 14PSI @ WOT. I wouldn't use it as my main pump. Napa is selling it for $227, Summit Racing $100. https://www.summitracing.com/search/brand/airtex/part-type/fuel-pumps-electric-external/fuel-type/diesel?page=2

Test the ignition switch with a volt meter or test light and see if there is voltage at wires that that should have none with key out of ignition. You'll need a wire diagram to help with this test.

Good to have you here. I see you live in Vista, CA. I lived there for 10 years and now in San Marcos.