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TomHanson · 01-13-2025, **(Subject: 2009 kw t660 )**

Okay, I know this will sound like a rookie question but bare with me. I cannot for the life of me find the location of my starter relay on this thing. Truck will not crank with the key, but will start up when I jump the starter solenoid. Dug into ecat and found my starter relay should be in the middle of the firewall, but it is not there. Looked in the fuse box by the clutch pedal in the cab, and there is nothing related to starter. No fuse box near firewall. Checked behind the dash, glove compartment, and battery box for any fuses/relays relating to the starter. Is this some weird thing where the starter is controlled by the ecm? There is 12v directly out of the ignition switch when I crank the key, but nothing at the starter.

Nostalgic · 01-13-2025, **(Subject: 2009 kw t660 )**

I've seen it mentioned for Peterbilt of the same era, not sure if the 660 has the same relay panel behind the center dash/steering wheel, but may be a starter interrupt relay causing your issue. There's "starter interrupt bypass" relay available if so. Should be mapped out on the fuse panel schematic sticker.

hhow55 · 01-14-2025, **(Subject: 2009 kw t660 )**

When i owned mine the starter relay was mounted on the firewall under the hood, in the center above top of engine.

TomHanson · 01-14-2025, **(Subject: 2009 kw t660 )**

(01-13-2025 )Nostalgic Wrote: I've seen it mentioned for Peterbilt of the same era, not sure if the 660 has the same relay panel behind the center dash/steering wheel, but may be a starter interrupt relay causing your issue. There's "starter interrupt bypass" relay available if so. Should be mapped out on the fuse panel schematic sticker.

There is nothing on my fuse panel label. I did find a pic online from a 2010 and it shows that on his. Weird sh#t man

TomHanson · 01-14-2025, **(Subject: 2009 kw t660 )**

(01-14-2025 )hhow55 Wrote: When i owned mine the starter relay was mounted on the firewall under the hood, in the center above top of engine.

According to the paccar diagrams it should be there. I can see there is 2 huck rivets there for it, but it is not there. This thing is kinda kicking my ass...

hhow55 · 01-15-2025, **(Subject: 2009 kw t660 )**

TomHanson · 01-16-2025, **(Subject: 2009 kw t660 )**

Sorry, been a few days since I gave an update. I did find it was actually located ON the starter. Tucked to the block side, so was unable to actually see it without knowing it was there. Anywho, I found that my issue was in the oem harness. Ran an overlay and we're back truckin!

Rawze · 01-16-2025, **(Subject: 2009 kw t660 )**

(01-16-2025 )TomHanson Wrote:
(01-15-2025 )hhow55 Wrote:

Sorry, been a few days since I gave an update. I did find it was actually located ON the starter. Tucked to the block side, so was unable to actually see it without knowing it was there. Anywho, I found that my issue was in the oem harness. Ran an overlay and we're back truckin!

If you know the spot where it went bad, can you post a pic or 2 of where that was?... maybe it helps someone in the future.

TomHanson · 01-17-2025, **(Subject: 2009 kw t660 )**

(01-16-2025 )Rawze Wrote:
(01-16-2025 )TomHanson Wrote:
(01-15-2025 )hhow55 Wrote:

Sorry, been a few days since I gave an update. I did find it was actually located ON the starter. Tucked to the block side, so was unable to actually see it without knowing it was there. Anywho, I found that my issue was in the oem harness. Ran an overlay and we're back truckin!

If you know the spot where it went bad, can you post a pic or 2 of where that was?... maybe it helps someone in the future.

thats the issue lol, I wasn't able to find it. I did know about a 10 foot span of where it went wrong, so I was able to run my overlay from there.