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You are watching: 1983 mercedes 380sl fuel pump relay location

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barisalcity.org Mercedes-Benz Forum > Mercedes-Benz tech Information and Support> tech Help
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checking 380SL Fuel Pump Relay
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On Sunday, the Wayward mrs ("81 380SL) turned over however refused come start. An extremely politely, in the garage. No noise indigenous fuel pump. I jumped pins 1 & 2, and also the pump ran, i m sorry would show a negative relay, but I made decision to run with the test in the hands-on to be sure. I believed I would write castle up, since they are relatively straighforward, and also there are problems that could lead to instead of a relay when a cable or the TDI (ignition unit) is bad.Note that this test is because that cars v the older six-pin relay. The tests for the more recent twelve-pin room different.Remove relay.1. Ignition off. Pen 2 - ground: 12V2. Ignition on. Pin 3 - ground: 12V3. Ignition off. Pen 2 - pen 5 (ground): 12V4. Check for RPM signal at pen 4 with starter operating. I ran this test v my twenty-year-old Sears analog dwell/RPM tester, connecting the lead that would usually go to "-" on the coil to pen 4.Insert relay partially.5. Check for voltage top top the partially-inserted pin 6 with the starter operating. Corrective action for measures 1-3 is fix open circuit. Action 4 is to inspect for a bad connection native the TDI, and also if none, replace the TDI (gulp!). Action 5 is to change the relay.


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__________________Chuck TaylorFalls Church VA"66 200, "66 230SL, "96 SL500. Sold: "81 380SL, "86 300E, "72 250C, "95 C220, 3 "84 280SL"s "90 420SEL, "72 280SE, "73 280C, "78 280SE, "70 280SL, "77 450SL, "85 380SL, "87 560SL, "85 380SL, "72 350SL, "96 S500 Coupe