98 379 oil and air buzzer staying on with key off

bad-luck · Mar 20, 2021

project359 said: ↑

Soooo.....Figured out what was going on. After looking at the truck and seeing what was happening it didn't make sense. With the old relay in place everything worked fine with the dash . Turn the key off and pull it out and the buzzer(s) would stay on . Had power going everywhere it should as if the key was on. Put the new relay in , that my dad pick up directly from "Peterbilt parts dept" and the truck would start but dash would not come on unless you jump the 2 big posts on the relay. I found it odd as if the relay wasn't getting the signal to close. I looked at the old relay and noticed it has 2 posts on the closing side and the one the dealer had given him was only 1. He had given them the VIN and they swore up n down it was correct. Original p/n was Bosch 0 332 002 150 , New from the dealer we were given Bosch 0 332 002 156.

Moral of the story , ensure the part numbers are correct even from the dealer. If its a superseded # find out why it was updated.Parts can physically look the same but internals completely different.

Thanks for all the help .
Click to expand...

Did it fix your problem? I am having a similar issue. My air buzzer warning is periodically going off with the key off. And now my digital clock stays on all the time. Truck starts fine

bad-luck · Mar 20, 2021

Old Man said: ↑

It’s the big relay behind the left dash panel. There is a big one with a small on back to back. The small one closes the big one powered the dash , ac fan ,wipers. It is not opening completely when key is off.
Replace both of them, not easy but I’ve done it twice, the skin will grow back on your hands.
Usually when it fails truck won’t start.
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I am having a similar issue. Ibhave a 2000 379. My air buzzer warning is periodically going off with the key off, and the blower motor will be running if I have left it on as well.. And now my digital clock stays on all the time. Truck starts fine, and buzzer stays off when I turn the key off. It them comes back on later.

jeffw362 · Jan 25, 2022

So did the 156 work or did you have to get another 150? Also what was the part number for the smaller relay you mentioned?

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