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this is not the ECU!! this is a bad fuse or fuseable link, very likely a problem in the wire harness. bad connection. ect. Sorry no easy replacement with your problem. It maybe a relay. but not likely. you need a cheep mulitmeter. for me to help you (need mor info)!! look for rusty pin conectiors (green in color). with your meter check that you get 12.5 volts to your alt. on the two small wires. and big one to. I bet you are not getting voltage to your regulator ( in the alt.) this is the small wires! if you jump 12 volts to the small wire e your alt. wil work this time only. trace this wire back to find your problem. hope this helps ya best of luck! a working alt. will produce 13 plus volts but only when the regulator is entergized!! in the small wire!!!!!

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Q: 1994 Mazda b4000 will not charge gauges wont work replaced alternator still not charging ECU?
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