How to check 50 amp box - Amprobe VPC-10 Voltage and Continuity tester

Could not find a main fuse in the diagrams I looked at. I would take a test light and go through the underhood fuse blocks and see if they are blown.

Some of these numbers don't make sense?
I have Never heard of 440v and 220v in a residential application, they are two different systems, 480 volt is typically 3 phase power, and 240v is typically single phase, more in likely you have a 200- 400 amp main service, and a 100- 200 amp secondary service for the welder, that can't be 110 @ 200 amps?
I would need more info, and pictures of actual nameplates of the equipment,
and then I could advise a safe NEC electrical code answer...

just looked in my code book 11nec 240.24a is the code its says readily accessible & max height 6ft7in so keep it bettween 4ft and 6.7in and you will be up to code good luck with you spa.

You probably should not replace a 50 and 75 with a 125. The problem is that although the 125 would have the capacity to supply the same current as the combined 50 and 75, each branch would be provided up to 125 alone, instead of the 50 or 70 that they were allowed before. That is, the 125 won't trip unless both branches exceeded their 50 and 70 amp limits simultaneously. If at any time one branch is drawing very little current, then the other branch would be delivered up to 125 amps. If it is OK that each branch can receive 125 amps alone, then a single 125 would be OK.
And if you have damage to the bus bar, you will have to replace the whole box.
On the other hand, if the existing wires will reach, you might be better off simply replacing all three boxes with one panel.
good luck, be safe Al K

Yes, there's a fuse box inside the hood for ac but there's one more in another fuse box inside the car for the ac control. Check the one inside first.

YEAR 98/05 Check fuse 6 in under bonnet box. 30 amp
YEAR 05/07 Check fuse 1 in under bonnet box 50/60 amp
Both fuses control engine coolant blower motor

They are there. They are hard to get to. What is the complaint? Have you checked the fuse? Blower fuse (50 amp) under the hood.HTR-AC fuse (25 amp) in the instrument panel fuse box

if your running a amp your power wire and rca"s are to close then you my have to seperate them.no amp double check wiring always try to keep power wires away from other wires signal jumps.they sell noise reduction boxes(cheap).i"ve had 50\50 results worth a try

Before you contemplate doing this I would check to see if the 200 amp wiring to your home can accommodate 300 amps. If not, I would not touch it. If it can then you can do it ever so carefully to make sure you do not light yourself up! I would kill your main 200 amp breaker and then tap into each existing branch a tap that will take at least 50 amps for each of the two legs on your new 100 amp breaker box. Good luck