[TR] Alternator not charging battery - 1976 TR6

DAVID MASSEY dave1massey at cs.com
Thu Oct 1 17:47:34 MDT 2020


 

We even tested at the back of the alternator and it only shows 12 volts (?). 
 This suggests that if you measure the resistance between the alternator output terminal and the battery positive it would read a very low resistance.  About the same as when you touch the meter leads together.  This will verify that the connection to the battery is good.  The fact that the voltage at the alternator is 12 volts means the alternator isn't producing.
What other possible fault could there be?  A bad ground?  But if the alternator wasn't grounded the light wouldn't behave properly.
It's tough troubleshooting something via this medium.
 
Dave 

 
 
-----Original Message-----
From: dctr6 at optonline.net
To: 'DAVID MASSEY' <dave1massey at cs.com>; triumphs at autox.team.net
Cc: 6pack at autox.team.net
Sent: Thu, Oct 1, 2020 4:31 pm
Subject: RE: [TR] Alternator not charging battery - 1976 TR6

#yiv9867486452 #yiv9867486452 -- _filtered {} _filtered {}#yiv9867486452 #yiv9867486452 p.yiv9867486452MsoNormal, #yiv9867486452 li.yiv9867486452MsoNormal, #yiv9867486452 div.yiv9867486452MsoNormal {margin:0in;font-size:11.0pt;font-family:sans-serif;}#yiv9867486452 a:link, #yiv9867486452 span.yiv9867486452MsoHyperlink {color:blue;text-decoration:underline;}#yiv9867486452 span.yiv9867486452EmailStyle26 {font-family:sans-serif;color:windowtext;}#yiv9867486452 .yiv9867486452MsoChpDefault {font-family:sans-serif;} _filtered {}#yiv9867486452 div.yiv9867486452WordSection1 {}#yiv9867486452 Dave –     We checked that connection and it was clean and tight.  We are STILL not getting any voltage from the alternator to the battery.  We walked through the procedure in Dan Master’s book 3 times and every time, it points to a bad alternator which I had tested and it’s putting out over 13 volts (maybe not enough but more than 12). Why doesn’t this show up at the battery?We even tested at the back of the alternator and it only shows 12 volts (?). Dennis   From: DAVID MASSEY <dave1massey at cs.com> 
Sent: Wednesday, September 30, 2020 5:31 PM
To: dctr6 at optonline.net; triumphs at autox.team.net
Cc: 6pack at autox.team.net
Subject: Re: [TR] Alternator not charging battery - 1976 TR6  On the 76 TR6 (well all the CF series cars) the alternator output (brown) wire connects to the power tap on the positive battery positive cable with a 3/8 QC connector.  If this connector is not making good connection even a good alternator will not charge the battery.  Check that out before you spend any more money.  Dave     -----Original Message-----
From: dctr6 at optonline.net
To: triumphs at autox.team.net
Cc: 6pack at autox.team.net
Sent: Wed, Sep 30, 2020 11:03 am
Subject: [TR] Alternator not charging battery - 1976 TR6   Here’s a synopsis – Almost new battery went dead. Charged battery and took car to shop. Meter shows alternator is not charging battery (only 12 volts, not 14.6 as per Dan Master’s book). Buy rebuilt alternator and the same thing happens.  Swap alternator for a second rebuilt unit – same thing, battery is not being charged. Tried 3 different meters – all showed 12 volts.  Hard to believe I got 2 bad rebuilt alternators.  What’s wrong??Dennis Culligan, 1976 TR6 ** triumphs at autox.team.net **

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