Date: Sat, 9 Jul 2011 16:59:19 -0700
Reply-To: mark drillock <mdrillock@COX.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: mark drillock <mdrillock@COX.NET>
Subject: Re: Fwd: Greek Single Cab + alternator help...
In-Reply-To: <CACGFLYU1b7WYaY7TRJBoR-btx+BOar34L3wNCs_atijND3Utkg@mail.gmail.com>
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Those are the wrong test points for your year. Those are for 80-84 only.
Check the ohms between 8 and 11 instead.
The alternator warning light circuit is a dual function circuit. When
the engine is first started a small current from the light circuit is
sent over the blue wire to energize the field of the alternator so
charging will begin. Then the alternator sends current back the other
way to turn off the light. You may not get any charging without the blue
wire connected and working. When you rev the engine up and the tach
starts working you should measure the charging voltage then, as it may
have started working at that point, if the tach is working.
Mark
Shawn Wright wrote:
> If I unplug the blue wire at the fridge relay under the seat, the LED
> goes out. I rarely use 12V on the fridge, so is it safe to leave this off?
>
> Bentley also suggested measuring between 9 & 13 at the intrustment panel
> connector - should be 140-160 ohms. I get 500 ohms which climbs to 800,
> so I assume there's a cap in there that may be failed? This seems less
> definitive than the blue wire at the relay however. The panel connector
> is very touchy so I need to try to bend the terminal pins to squeeze the
> foil contacts better.
>
> Then I'll try running it with the relay wire off an see if I get any
> charging.
>
> Thanks
>
> On Sat, Jul 9, 2011 at 3:20 PM, mark drillock <mdrillock@cox.net
> <mailto:mdrillock@cox.net>> wrote:
>
> Sounds like a wiring problem on the blue wire circuit. Measure the
> voltage on the loose end of the wire while the key is on and the
> light is on.
>
> With an 88 Westy the blue wire circuit has a leg under the driver
> seat, to the fridge relay. Maybe something is wrong there.
>
> Mark
>
> Shawn Wright wrote:
>
> Hi Mark,
>
> Thanks for the info. No, the LED does not go out when I
> disconnect the
> blue wire. What does this mean?
>
> Thanks
>
> On Thu, Jul 7, 2011 at 8:39 AM, mark drillock <mdrillock@cox.net
> <mailto:mdrillock@cox.net>
> <mailto:mdrillock@cox.net <mailto:mdrillock@cox.net>>> wrote:
>
> First, test the led circuit a little. When the key is turned
> on but
> engine not started does the alt led come on? If you then go
> back to
> the engine and disconnect the blue wire from the alternator
> does the
> alt led turn off?
>
> Mark
>
>
>
> Shawn Wright wrote:
>
> Sorry if this is a repost for some, but I didn't see
> this come
> through...
> I'm still stranded with a box of alternators and no
> charging... :-(
>
> It's an '88 Westy, with 1.6TD transplant, otherwise
> stock, using
> a 90A
> alernator, back half from the original Westy unit, and front
> half from a
> rebuilt A2 Jetta unit. I suspect there must be an issue
> in the
> van wiring,
> but not sure where to start looking.
>
> Thanks!
>
>
>
>
> --
> --
> Shawn Wright
>
>
>
>
> --
> --
> Shawn Wright
>
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