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#1
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W210 E420 repeatedly blowing fuses 7 and 4, it's not the blower
As the title says, I keep blowing out fuse 4 and fuse 7 immediately on putting the key in position 2.
If fuse 7 is left dead and fuse 4 is replaced, it stays alive -- fuse 4 only dies with fuse 7 but not alone. I unhooked the whole blower motor and resistor/regulator assembly from the harness, same behavior. I removed and unhooked the automatic climate control module and the behavior stops. If I plug in only the left plug of the automatic climate control, the fuses do not blow. If I plug in the right plug it blows. I bought a replacement climate control unit and the behavior is unchanged. Nothing new happened to go from fine to the current state, that I am aware of. It was working fine when I parked it, and the next time I drove it (this is my daily driver so it was a few hours later) it started the behavior outlined above. I had a similar behavior about a year ago (fuse 7 blowing) that I did not document or study extensively but it was resolved by replacing the automatic climate control module. This time that did not seem to help. There's not a lot of other stuff on this circuit so I'm unsure how to proceed.
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'81 240D 4 speed '97 E420 |
#2
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Try unplugging the auxiliary water pump.
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90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff |
#3
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just tried that, no change in fuse blowing.
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'81 240D 4 speed '97 E420 |
#4
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bump for fresh ideas
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'81 240D 4 speed '97 E420 |
#5
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bump
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'81 240D 4 speed '97 E420 |
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