Quote:
Originally Posted by pmckechnie
On my 84 500SEL the tach signal comes from the ignition module at the left front of the engine compartment. It is called the TD signal. If the fuel pump relay doesn't see this signal, the car wont run.
I don't know but I believe the Generation 2 gas cars are the same. Also, on the Gen 2 gas cars, the A/C won't work if it doesn't see the TD signal.
Sorry I can't be more specific.
Paul
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On my 85 500SE, I've been having trouble with the heat on all the time, then the AC stopped working, and after the shop switched out the AC regulator, the ACs working but the tach stopped working and the heat is still flowing all the time. Do you think the AC regulator swap and the tach now not working are related?