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CATEGORY LISTINGS > DETROIT > S60 tachometer feed. [ REFRESH ]
Thread Title:

S60 tachometer feed.


Created On Monday September 27, 2010 16:00 Diesel Talk
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olered
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Note Monday September 27, 2010 16:00 View thread in raw text format
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I have a S-60 in a '98 Freightliner(DDEC-3). I have a problem with the tachometer going wacky sometimes. Wild swings, nothing, and other times working. After trying a new gauge, I'm thinking it is the feedwire. Anyone have experience with this issue and/or know which sensor(s) the tach gets it signal?
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westcoast
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Note Monday September 27, 2010 17:03 View users profile View thread in raw text format
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If you have an inductive pick up in the flywheel housing your tacho will be hooked up to pin K1 in the 30 pin vehicle harness plug or you could have a single wire pick up on your alternator Regards David

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detroit
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JoeZ
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Note Monday September 27, 2010 18:18 View thread in raw text format
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If it is fed by the alternator, usually it is a wire terminal marked "W" on the alternator. If the alternator is intermittingly charging or about to fail, the tach will be erratic.

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One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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olered
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Note Tuesday September 28, 2010 05:53 View thread in raw text format
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Thanks David and JoeZ. My alternator hangs low on startup until revved past 1000 rpms or so, then it picks up. It has been doing this for the last several months and is getting worse. I have a new one that I carry with me, but haven't put it on yet since I just run local. Guess I'll get my lazy butt putting it on there!
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olered
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Note Tuesday October 19, 2010 20:52 View thread in raw text format
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After installing a new delco alternator(yes it is working right), no tach reading at all. The only wires to my alternator are the ground and hot with another short ground wire to the a/c bracket.
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olered
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Note Friday October 22, 2010 22:29 View thread in raw text format
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After trying another tachometer head, no luck. After installing a new alternator, the tach is not working at all. Once in awhile it will bounce a little, but that's it.
What in the heck could the problem be? Maybe it's just coincidence with the alternator install. Where to look now?
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westcoast
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Note Saturday October 23, 2010 19:55 View users profile View thread in raw text format
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Did your old alternator have a tacho wire Regards David

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detroit
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westcoast
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Note Saturday October 23, 2010 20:01 View users profile View thread in raw text format
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And check for your sensor in the bellhousing Regards David

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detroit
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olered
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Note Sunday October 24, 2010 08:14 View thread in raw text format
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The old alternator did not have any tach wire. Just the large guage hot and neg wires. I'll check for any bellhousing sensor.
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westcoast
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Note Monday October 25, 2010 02:21 View users profile View thread in raw text format
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And if no pick up in bellhousing - it,s ecm wired to K1 in your 30 pin engine harness plug Regards David

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detroit
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JoeZ
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Note Monday October 25, 2010 04:17 View thread in raw text format
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Are your engine hours changing?

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One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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olered
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Note Monday October 25, 2010 18:26 View thread in raw text format
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Well, no bellhousing sensor, and no alternator pickup. I took off the cab wiring harness from the ecm(the one with the 1/4" head bolt) and used a small screwdriver to snug up all of the female connectors in the plug itself. It was a much more snug fit and tightened the bolt up properly. The tach went from no response at all, to erracticly working.

JoeZ, I don't have any kind of hour meter on the truck.

Is there somewhere online where I can find a diagram for the 30 pin harness plug to identify exactly which one(K1) the tach reads from? I'm also in need of a diagram for my Freightliners cab wiring harness plug to identify where it terminates on the other end. Any other suggestions?
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westcoast
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Note Monday October 25, 2010 19:35 View users profile View thread in raw text format
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Turn the connector to face you , it has 8 locating dowels on the top section above the attaching bolt and 4 locators in the lower section thats the way to view the plug - top section left to right is 1,2,3 - from the top down a,b,c,d,e - lower section f,g,h,j and k so the pin on the lower left is K1 wire No 505 Regards David

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detroit
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stump
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Note Tuesday October 26, 2010 00:35 View thread in raw text format
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<< Well, no bellhousing sensor, and no alternator pickup. I took off the cab wiring harness from the ecm(the one with the 1/4" head bolt) and used a small screwdriver to snug up all of the female connectors in the plug itself. It was a much more snug fit and tightened the bolt up properly. The tach went from no response at all, to erracticly working.

JoeZ, I don't have any kind of hour meter on the truck.

Is there somewhere online where I can find a diagram for the 30 pin harness plug to identify exactly which one(K1) the tach reads from? I'm also in need of a diagram for my Freightliners cab wiring harness plug to identify where it terminates on the other end. Any other suggestions?
>>



http://supermiller.com/pdf/sk25038.pdf Here is a DDEC3 in a pete diagram
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Bullant18
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Note Tuesday March 22, 2016 20:21 View thread in raw text format
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Hi. Im having similar problems. Tacho sometimes works mostly not. Ecm is reading fine wuth diagnostic tool. Replaced tacho, still no good. New tacho has hr meter and not counting.
Ddec 3 ford 94.
Any help appreciated.
Thankyou.
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Brent
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Note Thursday March 24, 2016 16:32 View thread in raw text format
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I put a dd3 in a 82 w900 several years ago and seems there is a single wire that comes out the harness on the engine that I use to run the tach.
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