Thanks, I missed that on the wiring diag. Resistance is 760ohm, so something
is wrong, I'll have to check closer tonight. Thanks for the tip.

On Sat, Jul 9, 2011 at 4:59 PM, mark drillock <mdrillock@cox.net> wrote:

> 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
>>
>>

--
--
Shawn Wright