VW Suran Starting Issues Linked to Charging System Fix

Had a similar situation with my VW Golf GTI 2011. After a charging system repair, the slow cranking started, pointing to potential electrical fault issues rather than just a battery problem. The root cause turned out to be a deteriorated wiring harness near the starter motor, creating intermittent short circuit conditions. The previous repair work had disturbed some already weakened wiring insulation. The connectors at terminal 30 were also showing signs of corrosion, limiting power flow to the starter. The fix required: Complete inspection of the wiring harness, Replacement of corroded terminal connections, Testing the entire charging system circuit, Installing new protective sleeve on exposed wiring, Checking all fuse box connections This was a serious repair job since electrical problems can cascade into bigger issues if left unaddressed. The unstable power symptoms matched exactly what you describe, inconsistent starting and weak cranking. Getting a proper diagnosis with circuit testing is crucial, as surface-level fixes often miss underlying electrical faults. Would strongly recommend having a specialized electrical diagnostic done, focusing on the charging system and starter circuit integrity.

Thanks for sharing that detailed experience. I actually got my terminal connections and wiring harness replaced two months ago after similar starting problems. The voltage drop test showed major power loss at multiple points. Wondering, did you notice any other electrical gremlins pop up since your repair? The circuit breaker in my fuse box still seems a bit temperamental. Trying to figure out if I should have them take another look while the warranty coverage is still valid. Also, what did the full repair end up costing you? My bill came to 450€ for parts and labor but prices seem to vary quite a bit for electrical work.

After completing the repair work mentioned earlier, my starting issues got fully resolved when they fixed the Terminal 30 continuous plus connection. The mechanic found the battery was heavily discharged and needed attention, costing 290€ total for diagnostics and repair. The starter motor now engages smoothly every time, and the charging system maintains proper voltage levels. The ignition switch also works consistently without any voltage drop issues. Having a competent electrical specialist really made the difference in getting everything sorted properly. Regarding your circuit breaker concerns, that definitely warrants a warranty inspection. Intermittent electrical problems can indicate remaining short circuit risks that should be addressed before they worsen. With your previous wiring harness replacement, they should thoroughly check those connections since they relate to the current symptoms. The investment in proper electrical repair ultimately prevents more expensive problems down the road. Getting it checked while under warranty is the smart move, especially given your existing history with electrical gremlins.

Thanks for the input. I took the car back to my mechanic yesterday, armed with all this knowledge about the electrical system. Turns out there was still a loose connection in the ignition switch wiring that they missed during the first repair. The mechanic did a full power supply diagnostic and found some voltage inconsistencies. They had to rewire a section near the fuse box and replace a worn ignition switch assembly. The total came to 320€, but they covered part of it under the original repair warranty. The car starts perfectly now, no more slow cranking or power issues. The wiring harness looks much better organized too. Really glad I went back to get it properly sorted instead of just living with the intermittent problems. Having a proper electrical diagnosis made all the difference in finding the root cause.