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The "big red wire" you are referring to and have highlighted in the diagram is the B+ lead for the alternator. I would think a 20 amp fuse is going to be a little small for a 100 amp alternator. 13.87 volts from an operating alternator is low. The regulator set point is 14.8 volts. If the...

Do this first. Take the wire(s) off alternator #2's negative terminal and tape them up. Run a test wire from alternator #2's negative terminal to the negative post on the rear battery. Verify the large wire connected to the positive terminal on alternator #2 goes to the rear battery positive...

I think I may see your problem. The ground terminal on alternator #2 does not connect to the chassis ground, only to the negative battery post of the rear battery. Since the positive post on the front battery and the negative post on the rear battery are connected (the front and rear batteries...

If this is an isolated ground alternator and there is no connection to the isolated ground terminal (I don't see one in the picture), the alternator will not work. If you were to connect the positive post from the front battery directly to this terminal and it's isolated from ground, it cannot...

Why don't you take a picture of what you have now so maybe we can help you?

The alternator in the pictures is not isolated ground. The circle in the picture is the ground on an isolated ground alternator.

Is alternator #2 isolated ground?

I installed a 30SI clone. Installing a Delco 30SI alternator in a M915A1

Well, the inverter is not 100% efficient so the amps need will be higher. I have a 3500 watt inverter in my RV and I find the info in this link to be pretty accurate. Typical current requirements for inverters. While I agree that you will probably not run at max load under normal...

Keep in mind a 4k inverter will probably pull more current at full load than the alternators can supply. You will also have to run the engine significantly more than idle to get full output and to keep the alternators cool. Check to see what the inverter current draw is with different loads. I...

Plus 2 on checking the batteries. I've had bad batteries on my M818 act the same way after I had just shut the engine down. I thought the engine locked up. I barred it over and after a couple of revolutions, decided to check the batteries. New batteries solved the problem. Also, if it's not...

What a surprise. I do always look at springs, shackles, u-bolts, shocks, airbrake cans, hub seals, air lines, drive line, tires ect, etc, etc. So far the only problems I have found were a leaking hub seal on the M915A1 and a loose u-bolt on the front axle of my M35A2. Glad you found that before...

I had problems shifting the transfer case in my M929 occasionally. I found that if the truck was rolling it would shift easy. With the truck moving, put the transmission in neutral and shift the transfer case. You can also remove the washer from the transfer case linkage or turn the rod around...

Does it look and smell like gear oil? I don't know the spec, but it's at least 90w.

Very nice! Do you have any windows?

When you can explain how there is more weight on the trailer tandems than is on the tractor axles on a 80K semi tractor trailer (the example I used) then I will say you are right too. I too have seen you tube videos of massive oversize loads that when pulled across a suspension bridge caused the...

Yes. I have the same truck with A/C etc.

Maybe you don't understand the loading of a semi-truck trailer combination. The combination gross is 80,000 lbs. Of that load, 34,000 lbs are on the trailer tandems, 34,000 lbs on the tractor drivers, and 12,000 lbs on the steer axle. That means there is 46,000 lbs on the tractor vs 34,000 lbs...

Just have one made. Once the truck is lifted, determine what length you need and take the old drive shaft(s) to a drive line company. They will cut the yokes off the old tube and weld them on a new tube, balance it, and you are good to go.

I have two questions that need to have a yes answer before I tow something. 1. Can I stop the towed vehicle if the brakes on it fail or don't work? To me that means the towing vehicle needs to weigh the same or more than the towed vehicle and have good brakes. 2. Is the towing vehicle heavy...