veinedpanty Posted October 14 Share Posted October 14 I am experiencing a charging problem with my 2004 S430. I rebuilt the battery and alternator in January of this year, and it has functioned well until now. Last week, unexpectedly, the voltage significantly decreased when using the vehicle. I had to remove the battery and recharge it three times to get home. The battery maintains a voltage of 12.6 volts, suggesting it is functioning well. I possessed a guarantee for the alternator, therefore I placed an order for a replacement. I substituted it, nevertheless the same problems persisted. Upon first activation after a period of inactivity, I see a voltage of 14V, which thereafter diminishes progressively. The voltage is consistent at the battery, the fuse box under the carpet, and the alternator terminal when the engine is operating. I verified that the blue wire connected to the alternator has 12 volts when the engine is operating. Is this a problem with the prefuse junction box? Is there anything else I should verify before to placing the order? Link to comment Share on other sites More sharing options...
veinedpanty Posted October 14 Author Share Posted October 14 Both alternators passed bench tests at the auto parts shop. Link to comment Share on other sites More sharing options...
partexpat Posted October 14 Share Posted October 14 That automobile contains two fuses. Trunk next to the battery and passenger footwell. Is there any water located at the back? Link to comment Share on other sites More sharing options...
veinedpanty Posted October 14 Author Share Posted October 14 Upon inspection, there are no indications of water or discoloration around the rear SAM. I closely monitor the front drain owing to alarming accounts I have encountered. Link to comment Share on other sites More sharing options...
partexpat Posted October 14 Share Posted October 14 I replaced the front prefuse in my 2002. It is a formidable task. You train as a contortionist to gain leverage despite restricted visibility. The back component is readily accessible for inspection. Link to comment Share on other sites More sharing options...
partexpat Posted October 14 Share Posted October 14 Lastly, it may be evident, but are all your pulleys operating correctly? Is the serpentine belt in motion? Link to comment Share on other sites More sharing options...
veinedpanty Posted October 14 Author Share Posted October 14 Did you have comparable symptoms? I have inspected my back pre-fuse, and it seems to be functioning properly, to the best of my knowledge. Link to comment Share on other sites More sharing options...
veinedpanty Posted October 14 Author Share Posted October 14 I applied a socket to the alternator pulley, and it requires some effort to induce slippage. The tensioner, idler, and belt were changed in January. Link to comment Share on other sites More sharing options...
partexpat Posted October 14 Share Posted October 14 What occurs when you open the hood and activate the engine with a newly charged battery? Are the belts operational and functioning normally? Suddenly ceases functioning without any prior indications when operating a vehicle? Perhaps something was not connected properly? Link to comment Share on other sites More sharing options...
partexpat Posted October 14 Share Posted October 14 I addressed a battery depletion issue. Not during the act of running. Several modules are malfunctioning, along with overnight items. It took me many months to comprehend. Had to examine the whole CAM and wiring system to understand it. Attempting to generate ideas. Grounding concerns need consideration. The power is not transferring from the functional alternator to the operational battery. Link to comment Share on other sites More sharing options...
veinedpanty Posted October 14 Author Share Posted October 14 The voltage will initially be around 14 volts and thereafter decline to below 12 volts after a few minutes of operation, decreasing more rapidly when the headlights and other loads are activated. It seems that the alternator is not generating sufficient charge. Link to comment Share on other sites More sharing options...
1apissugar Posted October 14 Share Posted October 14 Perhaps a foolish inquiry. Have you checked all the connections to the alternator? Link to comment Share on other sites More sharing options...
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