Charging question on a 914-6 |
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Charging question on a 914-6 |
db9146 |
Jul 28 2018, 08:11 PM
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#1
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Senior Member Group: Members Posts: 953 Joined: 21-December 04 From: Atlanta, GA Member No.: 3,315 Region Association: None |
Well, I have made a temporary conversion of my -6, inserting a rebuilt 2.7S with ITBs, MS3, and distributorless ignition in place of the tired 2.0L. Before putting the engine in, I decided it best to install a new alternator along with a new engine/alternator wiring harness.
The alternator is for a 1965-1977 911 2.0-2.7 that uses an external VR. and here's the new wiring including a new ground strap to the engine case. The large red cable goes to the starter, the smaller red wire is D+, the black is DF, and brown is D-. I thought the problem might be the battery because of its age but when I checked the output of the charging system at the battery, there was none. I replaced some of the dash lights with LEDs but made sure not to replace the GEN warning light, which is not coming on despite the alternator not charging. Should I next pull the D+, DF, and D- plug and check for alternator output across DF and D+ momentarily? If there is output, what then? If not, what's next? |
db9146 |
Aug 2 2018, 09:03 PM
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#2
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Senior Member Group: Members Posts: 953 Joined: 21-December 04 From: Atlanta, GA Member No.: 3,315 Region Association: None |
MH, the engine is from a ‘74 911S but I’m not aware if they had dual batteries.
Spoke, thanks for the explanation. I understand what you have explained but I guess my only remaining question is: if the alternator was generating 13.7V, then why wasn’t I measuring 13.7V at the battery? I have always thought that measuring voltage across the terminals of the battery with the engine running was a measurement of the regulated output of the alternator. That’s why I was thinking that I had a charging problem. (BTW, I’ve got a full set of your front and rear LED lights. I love ‘em.) I have a new SS, adjustable VR on the way and will see if that makes a difference in the charging measured at the battery. |
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