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Bad wiring to alternator - T100 Toyota Cars & Trucks

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I need more information please, bad wiring... not enough will need to know more, such as, The wires to the alternator are bad, previous owner did a bad wiring job to the alternator, or i messed up the wiring to the alternator and need some advice.

Posted on Aug 01, 2008

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Take to a mechanic to wire your alternator and b sure to check to wiring from the alternator to the engine as well as the wiring from the battery to the alternator. a mechanic can fix wiring issues fairly quick and at minimall cost to you in my experience

Posted on Jul 05, 2014

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The belt could be slipping. Is the thick red wire hooked up at the alternator it should run from the alternator to the battery. Check voltage at the stud where the thick wire comes off the alternator if its not reading high 13's or low 14 volts your alternator is bad. I've gotten multiple brand new rebuilt alternators that were bad from the get go.

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The green wire should be your gen field wire not a ground wire. The alternator should be grounded through the alternator. The blue wire should be a feedback to the pcm only when the alternator is charging (engine running). Make sure your main 140amp charging fuse is good. It also has a battery temperature sensor that controls the field to the alternator. Wire 15 on ecm pnk/yellow to wire 4 blk/lt blue (c1 connector). This should be a variable resistor. If you have voltage on the Dk green wire when running but no output, suspect a bad alternator or bad connections going into the alternator. Be cure to test for alternator output on the alternator itself.

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I had the same problem on my 96'. It ended up being the mega-fuse, which is located on the left side of the fuse box under a plastic cover that slides up. It has two wires running to it(one of which is the main wire from the alt to the battery), and two bolts holding it in. Hope this helps.

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If alternator comes back fine you then you have a bad ground or positive wire which would definitely drain your battery.

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possibly wrong termination of wires @ alternator.

to drop off a battery cable is one old and reliable way to check charging system. if belts are tight and wiring is correct it is time to put a meter to alt and verify output voltage is within acceptable ranges.....

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