LED alternator warning light... New chrome alternator...

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recog
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Posts: 20

LED alternator warning light... New chrome alternator... Nov 6, 2018 19:55:34 GMT -5

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Post by recog on Nov 6, 2018 19:55:34 GMT -5

Just wanted to share that you can use an LED warning light, and it does not have to be an incandescent lamp as was the original bug...

Here is a link ("Rob and Dave"): www.vw-resource.com/alternator_wiring.html

( NOTICE the discussion under: Necessity for the Alternator Warning Light )

YES, they talk of the original incandescent lamp...

I used an Alpinetech Model: PL12MS-32 which mounts in a 12 mm hole... (YES, bought from Amazon with other electrical auto goodies... )

Here is a link of my revised dash in this area: drive.google.com/file/d/1ddKaQwklyRb4RjikoijwRTQ5lO1cDKSv/view?usp=sharing

THE KEY to doing this is use a 15 ohm power resistor in parallel with the LED. THIS provides the alternator electronics to sense the battery voltage.

HERE is a link showing where I mounted my 15 ohm 30 watt power resistor (per the "Bible", page "E2", use a 15 ohm 10 watt if you have one... I like to use items from my rich junk box? ...):

drive.google.com/file/d/1iJMzRRyl26kzjnacQbyBfSIS072uBu1j/view?usp=sharing

One end of the paralleled resistor and LED (LED red lead) must go to the battery side, such as ignition "run". The other (LED black lead) to the "alternator field" connection. YES, the male quick connect behind the alternator power terminal.

THIS works! ... THE Alpinetech LED is very bright with a nice little battery icon.

( FYI: Notice also my little toggle switch below the LED for the voltmeter. The voltmeter is below in the three inch area due to my three inch lift kit. The toggle switch nicely lets me select the alternator output or the battery voltage being displayed on the voltmeter ... Verifies the alternator is working! ... I was happy today to accelerate the engine and see 14.0 volts on the voltmeter! )

Hope this helps!

Last Edit: Nov 6, 2018 19:59:40 GMT -5 by recog

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recog
New Member

Posts: 20

LED alternator warning light... New chrome alternator... Nov 6, 2018 20:22:21 GMT -5

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Post by recog on Nov 6, 2018 20:22:21 GMT -5

MORE on dash electrical... QUESTION (applies to fuel and oil pressure):

MY VDO gauges (which are evidently NOT per "BIBLE", are a different connector configuration? ..... REFER TO our big blue book, Section 12, "INTERIOR TRIM", last page of section? .... ALSO, the above mentioned "E2" pages .... Screw studs from meter internal to standard 1/4 inch quick connect males .... )...

HERE is back of my "vintage/original(?)" fuel gauge:
drive.google.com/file/d/1VRwSs4nR82Ahc2X1jdaPjWbqLVBJNxPp/view?usp=sharing

I can not readily confirm/identify the terminals, and there is no labeling of these terminals on the meter? ... Hmmmm? ...

OKAY, the middle terminal is clearly ground, easily verified with meter... AND you can see the rivets.... But how does one know the other "outside terminals", left and right? ... One will be "instrument power" and the other is "signal" from the "sender" ... (EITHER fuel or oil pressure... ) ... I THINK I will check carefully with a variable supply ..........

UPDATE ... DID my own "BENCH TEST" of fuel gauge with some power resistors and variable voltage bench power supply....

MECH DIAGRAM METER BACK:

drive.google.com/file/d/1kTlEuljRa7Z_qXGAclpHotvcKgtmwtd_/view?usp=sharing

ELECTRICAL TEST SUMMARY (DAMPENING FUEL GAUGE DESIGN PROBLEM):

drive.google.com/file/d/1_nfJ1wNoVXTyGrMl-V1csRK_nTpxhsXc/view?usp=sharing

THE dampening problem (fuel gauge - when one bounces down the highway), causing the meter to peg is due to the wiper of the sender to go "open" --- high resistance... Interestingly many other vintage car owners report/comment elsewhere on this same issue (for example see comments on Amazon regarding the EQUUS 7361 fuel gauge) .... YES, as skip20 says, one solution is to go buy a new sender... TBD: THIS design challenge will be an item for future work....

Last Edit: Nov 7, 2018 9:55:44 GMT -5 by recog

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