1997 Chevrolet Express 2500 Questions

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If my in line fuse is 20 amp, my wire is red 18, which amp toggle do I use. Used vehicle previous toggle burnt out unmarked.
Is the headlight dash switch the problem, or is it something else?
I replaced the in tank fuel pump with sensor, corrected fuel gauge, thought it was out, and the P0339 code came up only after I replaced the fuel pump unit, showed no OBD 2 troubleshooting codes before. I replaced the P0339 code crankshaft sensor, and connector, and started instantly 5 times, took for test drive in driveway, and stalled and have not been able to restart for one week. The relay control center is now on after replacing the crankshaft sensor connector when off the whole time before.
One year ago my fuel gauge worked perfectly, then ran out of gas at 1/4 tank, now at over 1/4 tank I ran out of gas. My vehicle does not keep running now. Can the fuel sensor keep my van from running. Fuel pump pressure running is 55, key on is about 59. I have 198,000 miles on my van. OBD 2 shows O troubleshooting codes.
Replaced diagnosed Ignition Module, cleaned and replaced TBI, and put on a new AC idle air control valve, worn out key replaced, then replaced ingnition key switch. Still dies in a few minutes to 16 minutes. Drove forward once, and engine died, and engine lights on dash went out. Instrument cluster on dash light stays on "gages" with key on. No dash warning lights on while running. Did DBD 2 tool scan with 0 troubleshooting codes.
I blew the in line fuse 30amp to my toggle switch, and my van only runs 5 min. each time since about. A green 30amp fuse large in the relay box was corroded but the fuse tester said it was still good, replaced. I put a test light on fuses in relay control center and no light with key on. Fuel pump pressure is less than 60 recent test. Vehicle runs good for 5 minutes. After the fuse blew I drove over 90 miles then the motor was acting to cut out and sounded muffly.
the van turn on but when im driving for like 5 minutes go off. Why is that?
dont know how to find short any suggestions? Found P.E.D. fuse link with open eyelet not connected to anything.
how to replace rear main oil seal. leakin bad between eng and trans
The heat was only working on the highest speed for a while now. It stopped working completely and the fuse is good.
how to reprogram engine control module that is called VCM
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