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> Alternator question., Not Charging.
Olympic 914
post Mar 25 2018, 05:05 PM
Post #1


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Took the car out for a drive today, planning on going to dinner. everything is working as it should. getting on the PA turnpike and I had to accelerate briskly to get into traffic, and a moment later I noticed that the RED alternator light had come on. Pulled of at a wide spot to check the belt and wires and shut it off. Not checking the belt with it running. Belt good, plug tight, tapped the VR a couple times for good measure and started it back up. Light still on and now my Autometer AFR gauge just had bars. I know that is because it doesn't turn on until the voltage is +13v So not charging.

Now I am on a limited access highway with the next exit `12-15 miles away. Good thing had the battery fully charged on the tender before I left the house. So I made it to the next exit, turned around and headed back home for a total of 35 miles on battery only. Whew. But that shot dinner.....



Replace the VR with another I had that previously tested good. still no charging. checked the plug on the relay plate again. looks good.

I have not yet checked the wire connections at the alternator, possibly a wire vibrated loose during the brisk acceleration.

Now the question

I read to test the VR to short between D+ and DF and if the alternator is good voltage at the battery will go to alternator maximum of about 15-16V

So do I REMOVE the VR for this test? and jump between the D+ and DF at the relay plate.
OR
Leave the VR in place and short between those pins?
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Posts in this topic
Olympic 914   Alternator question.   Mar 25 2018, 05:05 PM
Spoke   Took the car out for a drive today, planning on g...   Mar 26 2018, 07:21 AM
Olympic 914   Yes, disconnect only the VR. Jump the D+ and DF...   Mar 26 2018, 08:37 AM
falcor75   Ground cable between gearbox and chassi?   Mar 26 2018, 08:47 AM
Olympic 914   Ground cable between gearbox and chassi? New, C...   Mar 26 2018, 08:55 AM
Mikey914   Well if all works well great. I'd try driving ...   Mar 26 2018, 09:40 AM
Olympic 914   Well if all works well great. I'd try driving...   Mar 26 2018, 09:50 AM
Olympic 914   So this alternator problem continues to vex me. ...   Apr 18 2018, 07:20 PM
malcolm2   Next step will be to pull the alternator and pro...   Apr 19 2018, 08:04 AM
McMark   Dying relay board?   Apr 19 2018, 05:30 AM
Olympic 914   Dying relay board? I did hook up another relay ...   Apr 19 2018, 06:20 AM
malcolm2   I have had some ALT probs too. Spoke must keep th...   Apr 19 2018, 07:08 AM
McMark   I think malcolm2 is right -- and I don't think...   Apr 19 2018, 07:34 AM
malcolm2   I am bored today. Hey Spoke, how is this???   Apr 19 2018, 09:13 AM
Olympic 914   There is also this. I performed the tests belo...   Apr 19 2018, 11:55 AM
McMark   Damn!!! That’s a fantastic post. :dr...   Apr 19 2018, 04:09 PM
bulitt   Yes, you must excite the Alternator to wake it up....   Apr 19 2018, 04:58 PM
Mikey914   Yes, you must excite the Alternator to wake it up...   Apr 20 2018, 10:20 AM
Edward Blume   I had my stock Bosch alternator professionally reb...   Apr 19 2018, 05:58 PM
jcd914   I don't recall the years but there was a TSB f...   Apr 20 2018, 10:36 AM
Olympic 914   On Thursday took the alternator to the local FLAPS...   Apr 22 2018, 11:52 AM
Spoke   :beer2:   Apr 22 2018, 12:07 PM
GregAmy   That post #15 is a gem... Camping onto this one f...   May 13 2018, 01:22 PM
Spoke   Does everyone else's GEN light come on with k...   May 13 2018, 02:20 PM
GregAmy   Yes, the light is on with key on and engine not ru...   May 13 2018, 03:45 PM
Spoke   Yes, the light is on with key on and engine not r...   May 13 2018, 05:30 PM
GregAmy   = About the measurements, here's what I think...   May 14 2018, 05:05 AM
GregAmy   = About the measurements, here's what I think...   May 14 2018, 03:55 PM
euro911   Jerry, what's the best method for bench testin...   May 14 2018, 02:27 AM
GregAmy   Aaaaand a new voltage regulator... ...didn't ...   May 14 2018, 04:32 PM
Spoke   Bummer. I didn't think the VR was at fault but...   May 15 2018, 07:04 PM
GregAmy   Yep. All grounds and battery cables replaced by me...   May 16 2018, 06:42 AM
dangrouche   Yep. All grounds and battery cables replaced by m...   May 17 2018, 11:27 AM
GregAmy   the pigtail at the alternator end needs the altern...   May 18 2018, 08:07 AM
dangrouche   https://www.aspwholesale.com/index.php here is a ...   May 18 2018, 11:24 AM


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