I put my battery in backwards an snow it won't

SOURCE: fuel pump relay, fuse??

check there should be a fuse box under the hood are some small little black are green boxes under the hood one of them is your fuel pump relay.

SOURCE: No power to ignition - ? please help! 91 amigo 2.3l

If everything is turning on, and there's power... check for 12V at the alternator. it may be out now.... or a connector came loose, or wire broke.

SOURCE: 93 corolla 1.8 No start Blown ignition fuse

I had a prolem like this one time a while back. what i did was got the wiring diagram and checked everything that was running through that 30 amp fuse. on the one i was working on it ended up being an injector wire pinched under the valve cover and it didnt short out till the car was driven til it warmed up and expanded after the valve cover gasket was changed. hope this helps!

Joe Taylor

• 2229 Answers
• Posted on Jun 12, 2011

SOURCE: My 2005 Yukon denali won't

My guess would be the anti theft security system. When this system starts to fail, it turns off the starter from the ignition. The fact that you can hard start it proves this. Read this link for symptoms, info, pictures, and solutions to this problem. http://vatspasslockpasskeysecurityhelp.yolasite.com/

Clifford Beard

• 1975 Answers
• Posted on Feb 29, 2012

SOURCE: 2000 ford mustang 3.8 no power at fuel pump fuse is good relay is good it does have a anti theft device, inertia is good

You have a fuel pu,p driver module that gets the power from the inertia switch and the power for the fuel pump comes from that module. I would start by checking for a wiring problem. Below is a picture of where that module is located. At the plug of the module you want to make sure you have good continuity from the pink and black wire at the module to the inertia switch. Then you will want to make sure you have continuity from the fuel pump to the module in the brown and pink wire. That should be the power source to the fuel pump. One other thing to keep in mind and that is the PCM controls ground to the fuel pump so this may be an issue. Try that first to see if you have a wiring problem. If you have power from the inertia to the module but no power coming out of it to the fuel pump this may be your problem. Hope I was able to help...