My Bravada will not start and keeps blowing the crank fuse. Does anyone know what I need to do to solve this problem?

No, year make or model. But if you blow the crank fuse, it is between the starter and the ignition switch. Could be the switch, but most likely the wire. At the relay there are four pins. 30 is B+ all the time, 87 is to the starter. 85 and 86 can be switched. But one is B+ with the key in start position, the other goes to the ECM, this would be ground.. Since you're blowing the fuse, you need to find the short to ground. this would be the 85 and 86 wires.

It is likely that you have a wire rubbing on the body somewhere. This will intermittently short on the body and blow the fuse. You are going to need to search the wiring the find where the damage is and repair it. If you keep driving the problem is likely to get progressively worse as the wire gets more damaged.

There is only ONE reson why a fuse blows: Something is overloading the circuit and drawing more amperage than the fuse is designed to handle. This is what is known as an "overload" or a "short circuit".

Plesase read the following two articles:
Where's the fuse?
What else could be wrong?

If after reading these two articles, you think you would like to try your hand at tracking this down and fixing it yourself, and you are sure you have the correct equipment (as listed in the articles), let me know and I will help walk you through it.

AC not working?

on a hot day it will blow warm/hot air if the AC is turned off or not working

If its hot air and AC is working then i would start by checking the fuse or relay. if its not the fuse/relay then i would look into the heater box there is a door that blocks the hot air

Crawl under, and take a look at the starter. If you see that the wire is burnt, especially on the exhaust manifold, you've found your problem. If not, run your way up to the battery, and up to the key switch.

90 Safari van 4.3 engine EMC fuse keeps blowing, found white wire
going to the injector grounded out, solved my problem.
hope this helps from bustedknuckles.........

look for fuse under back seat that says ecas.my compressor also quit but i keep blowing the fuse when i change it .so i have other prob .good luck

Well buddy by now i hope ur problem must have been solved...But if in any case its now, then let me ask u to try to get ur fuel pump checked first instead of directly changing it. Ask ur mechanic to check the motor of the pump and the inwards and outwards flow of the fuel. if thats ok then no need to change. If thats not ok, then first ask him to change it, it might cost u 200 $ for a new branded one from nissan company. And check ur "Check Engine Light", it shud be on, so get ur car computer reprogrammed by the company. If yet ur car doesnt starts, then check ur Air Flow Sensor and Crank Sensor. Any one of these might not be working for sure.

Check and let me know if it worked. If it didnt email me on [email protected]

I will solve ur problem definitely as I also have the same car.

regards.

7.5A fuse keeps blowing because there is an electrical connection fault. Take the car for diagnosis.

You have a wire rubbing on something metal. Look at the wiring harness in the car and engine compartment. Try moving them around a bit and see if you can get the fuse to blow or not to blow.