How do I find and replace the 7.5 Amp battery charger fuse?

Here's a link to a bunch of replacement chargers....

https://www.google.com/search?q=Invacare+M51+Surestep+replacement+charger&newwindow=1&sxsrf=APwXEddmA91gRXeJPK8JzJf9dHNyEAAvMQ%3A1682171313277&source=hp&ei=seVDZLTIDv3OkPIPkd-S8Ag&iflsig=AOEireoAAAAAZEPzwSyXMv34ozadubH2bPfwxcQtlSi0&ved=0ahUKEwj05M680L3-AhV9J0QIHZGvBI4Q4dUDCAs&uact=5&oq=Invacare+M51+Surestep+replacement+charger&gs_lcp=Cgdnd3Mtd2l6EAMyBQghEKABMgUIIRCgATIFCCEQoAE6BggAEBYQHjoICAAQigUQhgM6BQghEKsCUABYglVgkFpoAHAAeACAAe0BiAGGGJIBBjAuMjAuMZgBAKABAqABAQ&sclient=gws-wiz

Best to you

Repair; can be carried out through your supplier or local Mobility outlet.
Replace; fleabay, amazon or your Mobility shop.

Hi Linda.
not sure if this will help you out,i found this on the internet.
Battery Charger Troubleshooter
When there is a battery failure, there is a possibility it was caused by a bad battery charger. When the charger is only plugged into the wall, it should show a green light. If there is no light showing, confirm that the outlet is good. If the outlet is good, it is very possible that the issue is with the battery charger, not the battery.
If the charger is plugged into the battery only, it should show a green light. (If you have purchased a new charger within the last year, you will not get a green light if the charger is only plugged into the battery. You will get a green light however if the wall charger is just plugged into the wall and not plugged into the wiring harness) If it does not show a green light, it is likely that the charger is not making contact with the battery. The most likely reason for this is a faulty fuse on the wiring harness. This fuse is a 2-amp automotive fuse, and it should be replaced with a 2 or 3-amp fuse available anywhere that sells auto parts. The fuse can blow out if there is a short in the charging system, or if the plug-in end of the wiring harness comes in contact with a battery terminal.
When the charger is plugged into both an electrical outlet and the battery, there should be a red light showing on the charger. A red light showing indicates that the charger is in contact with the battery and is actively charging the battery. Once the battery has reached a voltage level that is considered "fully charged" the red light changes to green. If after 24 hours the light has not changed to green there is no cause for alarm! Remember that when the light is red, the battery is being charged, and you will be able to use your system. After 24 hours or so, your battery is as charged as it is going to get, and if the light is still showing red you should disconnect the charger and go fishing. Replacement chargers and parts can be purchased directly from MarCum's website.
If you are really concerned about your battery, consider getting a basic volt meter to check the voltage of your battery. They can be bought for less than 20 dollars and will show you exactly what the voltage level of your battery is. If after 24 hours of charging your battery should have at least 12 volts (ideally 13-14 volts) and as long as it is over 12 volts it will work. If it is not at or above 12 volts you should consider replacing the battery. If your unit starts to malfunction while you are fishing, it would not come as a surprise that the voltage has dropped down to 11 volts or lower.
If the charger is plugged into the wall and battery, and you get a blinking light on the charger, it is very likely that the battery is faulty and should be replaced.
Batteries are an expendable item, and must be replaced periodically. Any store that sells ice fishing electronics will stock suitable batteries. You can also buy them at a specialty battery store, or by ordering one from our website.The batteries that you should use are the "Sealed Lead Acid" variety, they are 12 volts, and range from 7 to 9 amps. The more amps the battery has the longer it will run on a full charge. Your MarCum unit can be powered off of any battery that is 12 volts, even a large automotive or deep cycle batteries will work.
or go to this link and have a read up.

battery charger is blinking geen Google Search

Need to change the flux capacitor.

check that you have the red lead of the charger on the positive terminal of the battery and the black lead on the negative terminal of the battery. Next check the voltage to be charged is selected correctly 6 volt or 12 volt. next check the rating of the fuse used as 3.15 amp may be too low for the charger. I would not go greater than 5 amp at best. Lastly have the charger checked by an accredited electrician for internal shorts.

There is a fuse inside. The fuse plugs into a socket holder. The value I think is 7 amp. Verify it is good or replace with the value listed by the fuse holder. Also sometimes if the charger has an overload due to a bad battery, unplug the charger and wait about an hour then plug it in again, It might just start working

There are several solutions to this problem which I have seen twice in my technical career.
You indicated that the power light on the charger comes on which indicates it is plugged into a working AC wall outlet. Check to make sure the power switch of the charger is turned on. Make sure that the round charger plug is plugged all the way into the battery charger receptacle on the battery box.
Next, check the on-board fuse AND the circuit breaker. I have had this little 5 Amp automotive style fuse burn out on several go go's and the charger does not work. Pull back the cover over the charger port and look for the fuse in its center slot. With a good set of fingernails it can be pulled straight out and inspected. Use fine needle nose pliers if necessary. I am assuming the go go runs and the push-button for the 15 Amp circuit breaker is pushed in. If it is out and the go go is not running reset the breaker by pushing the white button in. There is a clear rubber boot over the button. In my experience, the 5 amp auto fuse is your most likely problem. By holding it up to the light you can see if the fuse wire inside is burnt causing an open circuit. Most auto and hardware stores have this fuse in stock. Bring the old one to the store for comparison. It is a 5 Amp ATO fuse.
The question my clients often ask is what caused the charger circuit to overheat and the fuse to blow? The simple answer is that the two 12 Amp hour batteries in the go go are probably old and weak. This causes the charger to work too hard and the circuit to overheat and the fuse to blow. These small batteries have a short life span of between 6 months and 1 year depending on type. I recommend the AGM (advanced glass mat) batteries for longevity. Also make sure the charger being used on the chair is the 2 Amp small charger that came with the chair (There is a label on the charger to verify this). A larger charger will burn the batteries(shortening their life) and burn out the 5 Amp on-board fuse. Hope this helps.

1st Check the 25amp inline fuse located behind the volt meter. 2nd Check the 50 amp fuse located behind the foot rest. A pin located under the foot rest when pulled out will open the front to access the fuse.

you need to go to a **** smith store and bye a kit to do this cheers peter