1997 LS400 170K miles, Coolant Leaks, alternator not charging, ...
#76
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If you look at photo 1 the minus sign is out side the circle just like the one Yamae pointed out and is on the trace that the cap connects to. Also the brown cap in picture 1 is connected the opposite direction of the sign, but can't see the whole board so don't know. If its not working then the polarities must be messed up. Now you need pictures from an untouched board to know whats going on if you can't trust the signage.
#77
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Dicer, Thanks for your reply. The polarity of the capacitors is correct. Please refer my response to Yamae: "Thank you sire, Yamae for your prompt reply. I think the polarity is correct. I made sure the polarity of the capacitor match the old one when I was replacing the capacitors. In fact, I found all capacitors on the ECU have their negatives pointing to one same side and the positives point the other same side. The positive sign you saw was for the C131 (the smaller blue one). I do have a question on the repaired trace. The repaired trace has about 25Ohm, where the original copper trace has almost 0Ohm. Would that cause a problem? This trace gets the power from the battery."
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I took the alternator out. I have a quick question. I would like to start the engine without the alternator to troubleshoot (meaning without the serpentine belt). Is it safe (without causing further damage to the engine) to run the engine without the belt for a few minutes?
Thanks.
Thanks.
#81
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Are you sure you did a good soldering job? One can see lots of "cold joints". Ever heard of desoldering braid (to clean up excess solder) and flux?
Last edited by plexus914; 08-29-16 at 07:06 AM.
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