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Broken Tach on 7040
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NYREDPOWER View Drop Down
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Joined: 11 Jan 2011
Points: 11 		Post Options Post Options   Thanks (0) Thanks(0)   Quote NYREDPOWER Quote  Post ReplyReply Direct Link To This Post Topic: Broken Tach on 7040
    Posted: 03 Mar 2011 at 9:03pm
Ive been getting to know my 7040. I understand it is common for the tach to be broken what should I do to fix it thanks
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MACK View Drop Down
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Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar 2011 at 9:18pm

Is it broken or don't work?   MACK
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NYREDPOWER View Drop Down
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Joined: 11 Jan 2011
Points: 11 		Post Options Post Options   Thanks (0) Thanks(0)   Quote NYREDPOWER Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar 2011 at 9:21pm
it does not work
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monitordoc View Drop Down
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Joined: 15 Feb 2010
Location: Minnesota
Points: 187 		Post Options Post Options   Thanks (0) Thanks(0)   Quote monitordoc Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar 2011 at 10:59pm
 NEIHOFF (SPELLING) ALTERNATORS DID A NUMBER ON MANY 70 AND 80 SERIES TACHS. MOST ARE REPAIRABLE.
 PM ME FOR MORE INFO.
WD,D17-S4,180,D21
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scott View Drop Down
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Joined: 12 Sep 2009
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Points: 2659 		Post Options Post Options   Thanks (0) Thanks(0)   Quote scott Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2011 at 6:39am
Since the day I got it my 7040 tach has not worked.  Hr meter yes, tachometer no. I licked my finger and drew a line on the dash and thats where the throttle lever goes.
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MACK View Drop Down
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Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2011 at 7:54am
Don't know which alt. you have, but if it is a delco with the stub plugin on back the connection could be the problem. Could be a set of windings burned up in alt. Should be a small brown wire hooked to alt. check for bad connection in plug in between back of motor and fire wall.   MACK
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Points: 176 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jmm Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2011 at 2:32pm
As a matter of interest:  I had the same problem and when I replaced the alt I used a cheapy model for a GM (fit perfect) and opened it up and tapped the tach wire before the rectifier.  works good!
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