Electrical Question #15 Need Help Please, I'm totally stumped this time |
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Electrical Question #15 Need Help Please, I'm totally stumped this time |
76-914 |
Apr 6 2014, 06:33 PM
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,611 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
I'm going to have several electrical questions. 1st, Is pin #8, on the 14 pin plug at the relay board, the only switched 12v+ source in the engine compartment? TIA, Kent
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76-914 |
Jul 13 2016, 06:05 PM
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,611 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
Question #11 - I want to lower my AC fan speeds about 50%. Can I use a 12v to 6v step down transformer to do this? What are your recommendations on how this can be accomplished. TIA
Question #12 - I can read (or so I say) schematics and flow charts but damned if I can draw one. (IMG:style_emoticons/default/mad.gif) I want to create a schematic that shows my new conversion wiring and where it ties into the OEM wiring. Has anyone here done that? If I saw how someone else did theirs I'm sure I could extrapolate the info I need from your schematics. Or if not, a link to on "how to" draw schematics would help. |
Spoke |
Jul 13 2016, 11:22 PM
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Jerry Group: Members Posts: 7,052 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
Question #11 - I want to lower my AC fan speeds about 50%. Can I use a 12v to 6v step down transformer to do this? What are your recommendations on how this can be accomplished. TIA The simplest way to slow the fan for AC is to add a power resistor in series with the fan. My '97 Audi A6 used a power resistor to provide a slower fan speed for the first level of radiator cooling. To properly size the resistor, one has to know the current draw of the fan at the reduced voltage. Did the fan come with any specifications like current draw or power rating in watts? For a starting point, let's say the current draw at 6V across the fan is 2A. (a guess) Thus the resistor has to drop 14V - 6V = 8V with 2A flowing. The resistor value needed would be 8V/2A = 4 ohm. The power dissipation of the resistor would be V x I = 8V x 2A = 16W. In this example, it would be safe to use a 50W resistor like the one below available at Digikey for less than $4. Shipping will cost more than the part. The part below is 4.7 ohm and is just an example. Adjust the numbers above as needed for actual specs or measurements. 4.7 OHM 5% 50W |
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