1994 BMW 525i voltage problem

1994 BMW 525I
186,000 MILES • 2.5L • 6 CYL • RWD • AUTOMATIC
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3DARRYL1GREENE3
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My ECU can't read my battery input,i have a new battery, my positive wire show no sign of corrosion is it possible that the wire is damaged internally? And my fuel pump turn slow but when I run straight power it runs normal and gas comes out but when it's hooked up regulator it tickle.
Mar 13, 2014 at 9:43 AM
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KNOWLEDGE IS POWER
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start with your battery cables. make sure the ground cable is tight and tight on both ends. if you can read the voltage at he ecm plug with a meter youll know if youre getting full battery power there or not. the ecm has a minimum voltage requirement. a loose ground or power cable can cause both no ecm and a slow fuel pump that runs fine when jumped to the battery
Mar 13, 2014 at 9:09 PM
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