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 |
Jul 30 2018, 08:51 AM
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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 |
Thanks Larry.
I hate electrical issues..... Okay, the GEN light was on with the key on, and off as soon as I started the car yet when I checked the battery charging, the battery voltage was unchanged with the engine running at a fast idle. So I swapped the VR and tried again. I am now seeing a voltage increase to 13.14.... better but still not what you would expect. I'm measuring with a multimeter across the terminals with the engine at about 1800-2000. The harness from the new alternator to the starter motor and from the starter to the battery is all new and built from one of Perry Kiehl's kits, so its all properly sized. I installed new braided grounds at the alternator, the trans, and the battery. I've checked the battery and trans and they're tight. I remember distinctly tightening the strap on the alternator to engine case (and oriented it so it would foul anything). I did paint the trans but I can't believe that would be an issue with a new braided cable and hardware. Any other ideas to consider to improve the low charging voltage? |
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