My Navman 80T won't charge in the car using the cable it came with, any ideas?

Stop using that charger. I sounds like you have a break in the wire and when you hold it in the right position, the two pieces touch and current flows. Unfortunately the heat is probably being caused by arcing and is a potential fire hazard.

on a lot of these late model computer base cars when battery power get low the computer gets confused. try this disconnect the neg. battery cable. charge the battery. reconnect and try again. my son cobalt battery went bad key was stuck in the igntion. good luck.

The battery might be nearing the end of it's useful life and needs to be replaced. The battery only lasts for so long then it has to be replaced.

Buy a battery on ebay base on your computer's Make and model, not the model of the battery.

replace the battery- sounds like it's completely shot. If it still doesn't try- use a micro usb cable attached to a PC- if it still won't charge/come on- the charge board is gone, and you will likely need to replace the phone

I’m happy to help further over the phone at https://www.6ya.com/expert/susan_42b401e0b1603d8a

The traffic receiver is in the car charger cable. The charger should have a red light on if it is getting power. If the light is on and the unit is not charging and you have no traffic, the charger cable is bad. If the light is off, then either the fuse did not fix the problem, blew again, or is somehow not sitting properly in the charger. Another thing you can check is by using the unit in another vehicle. If it works fine there, then the charger is not making good contact with your vehicle outlet for some reason. You will probably have to buy a new traffic receiver charging cable.

Well, if the Batt don't hold charge then check the regulator on the bike with an Ohmmeter you can buy one at an Auto parts shop....motor running you should see 14.5 V if not then the Reg is out!!!

if it wont charge it most likely has a bad battery...if you just bought it, I would suggest returning it for a replacement. Make the vendor or manufacturer make good on their product.

If it's not the original Navman usb loader then there's a easy solution to this : With a sharp knife carefully open the usb cable : you'll see four tiny cable's with different colours . You;ll have to cut two of those four cables ; Leave the black and red cable intact.
Use some tape to fix the cut in the usb cable. Now you can use your car charger and your navman won't go into usb mode.

Your Navman will not run in car unless the output on the charger is 1000ma or 1a. you need to buy a genuine charger, motorola phone chargers do not have the output to run the unit

that is probably due to the battery being totaly dead,
try using a mobile phone charger (nokia),
usb is for data transfers.