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Old 01-24-2016, 03:25 PM   #1681
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1984 34.5' Airstream 345
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Thanks for the replies. The reason I am asking is I have the same problems that you and bkahler outlined regarding the voltage drop when headlights etc. are turned on. I realize PeterH-Airstreamer fixed the same problem with a Alternator replacement but I don't believe we all have defective Alternators.
Keyair what information did you provide to the supplier of your Voltage Regulator to assure you received the correct replacement?
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Old 01-24-2016, 05:57 PM   #1682
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I was a little surprised that Peter's problem was solved by replacing the alternator which goes to show at times it can be just about anything.

Best thing to do is check all your grounds and connections. To many of the circuits on these rigs are undersized which leads to voltage drops and higher current draw. The lighting circuit is probably the worst for being overloaded.

Try separating the headlights to their own relays driven off of the headlight switch. I think you'll be amazed at the difference.
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Old 01-24-2016, 06:11 PM   #1683
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Quote:
Originally Posted by bkahler View Post
I was a little surprised that Peter's problem was solved by replacing the alternator which goes to show at times it can be just about anything.
......
I believe its the sum of many things. With the alternator replacement, I also increased the wire gauge from 10 to 8. After I replaced the motor battery yesterday, I noticed another slight voltage improvement. I suppose a bad battery can also be a drain on the system and since the alternator really is charging 1 engine and 2 house batteries, it may be well worth the effort to check them often.
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Old 01-24-2016, 06:42 PM   #1684
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But don't take my word for it, here are the hard facts.
Before I replaced alternator and wires, I would barely get 12v idling with headlights on.
Today with a new house battery, this is was i get (and this is just a 63 amp alt for the time being):
first picture-Engine idling at ~800 headlights on 14.3 Volts (verified by my EFI monitoring software)
second picture-Engine idling at ~800 , headlights on, fog lights on, 2 80 watt radiator fans on, radio at full blast, heater at HIGH 12.3 volts
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Old 01-25-2016, 08:13 AM   #1685
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Peter, I remember trips in my old 310 where at night with the head lights on, dash AC running and trailer lights connected the dash volt meter would drop below 12 volts and hover at 11 volts. Not a pleasant feeling to watch that gauge while you're driving

It would always stay above 12 until I turned the lights on and then it would drop.
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Old 01-25-2016, 09:05 AM   #1686
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Brad my coach does the same thing when I put the headlights on, and my heat gauge also goes from 180 to 200. Did you ever figure what caused that
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Old 01-25-2016, 09:21 AM   #1687
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Brad my coach does the same thing when I put the headlights on, and my heat gauge also goes from 180 to 200. Did you ever figure what caused that
John, I forgot to mention the heat gauge on the 310 also increased in temp when as the voltage dropped. The gauges are voltage dependent so when voltage goes up or down so will the readings on the gauges.

I firmly believe the voltage issue is mainly due to wire sizing and poor connections. Try increasing the wire size from the alternator to the battery and the battery Isolator. As it did in Peter's case it should make a difference in yours as well.
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Old 01-25-2016, 11:42 PM   #1688
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Hope to be at the MH next week now...
Got a distraction on my Bench...




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Old 01-27-2016, 05:48 AM   #1689
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Steve's replacing his lump and going all STI on us. More hp and AWD to boot.

Cheers
Tony
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Old 01-27-2016, 10:51 AM   #1690
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Lol Tony.
Just a stock 2.5 SOHC, non turbo motor for the kids Outback... Hopefully this will last him thru UCLA and on thru Graduate school...
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Old 01-27-2016, 11:13 AM   #1691
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Have you calculated what the rebuild is going to cost? I've got a Forester with 229K and this is likely in my future - I've got an occasional cold start clatter.

Thanks!
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Old 01-27-2016, 02:19 PM   #1692
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Hi Paul and Tam!
PM me your email address and we can talk directly about what the story is on these Boxer motors...
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Old 05-25-2016, 04:05 PM   #1693
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Quote:
Originally Posted by Keyair View Post
Not yet Gunner, not been back to storage due to Obamacare deadlines(I am a Health Broker) and the GF's Range Rover brake issue, which has not turned out to be a simple fix... Surprise! So far we have replaced the ABS pump, ABS relay, ABS fuse and now the whole fusebox... Now awaiting more parts...
Also, the dreaded Subaru motor is back from the Machine shop and I am amassing parts/seals/gaskets ready for the rebuild.

I hope to get over there next week, and do that, and also get a photo of my wierd "Black Box" on my genset that I thought was normal, but clearly is not!
Just following up to see if you ever installed the new Voltage Regulator and is so what were the results?
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Old 05-26-2016, 01:57 PM   #1694
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Maybe Steve's still working on that Subaru engine rebuild.
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