 wiring seat heaters, wiring seat heaters |
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| keely444 |
 May 17 2015, 02:46 PM
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#1
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Member  Group: Members Posts: 103 Joined: 4-May 15 From: santa cruz Member No.: 18,702 Region Association: None  |
I needed some help tapping in to a switched power source for some seat heaters.
I have a headed set up and no heat so I thought this would be a good option. it requires 10 amps for each seat. I have only had the 914 for a week and don't know my way around the electrical yet. The car is a 74 2.0 .I would like to use a piggyback connector at the fuse box. I read that red with a white stripe is switched power. |
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| toolguy |
May 17 2015, 03:03 PM
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#2
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Senior Member Group: Members Posts: 1,267 Joined: 2-April 11 From: San Diego / El Cajon Member No.: 12,889 Region Association: Southern California 
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20 amps is a lot to suck through the factory main wiring in addition to what would be used with headlights, fog lights, stop lights, tail lights, radio, wiper, heater blower, etc. . You need to figure out the maximum amp usage and have a main power lead capable of carrying that current safely. . .probably a lot simpler to run a separate lead for the seats heaters. .
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| jim_hoyland |
May 17 2015, 03:27 PM
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#3
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Get that VIN ? Group: Members Posts: 9,296 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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I have a hard time seeing 20 amps; I've installed heated seats and run them from the relay board in the engine compartment. Haven't had a problem since installed, voltmeter hardly moves when both seats are on.
Here's how I wired them: 1. First, I did not have rear window defrost. So I wired the seat heater controller just like the rear window defrost circuit. 2. Mounted a defrost switch into the dash. It gets switched power from fuse panel and is used to energize the Defrost Relay on the rear relay board. I ran a 16au wire from the switch to the relay board. 3. The front of the relay board has two round pins for the defrost circuit; one will be for your wire from the dash ( the trigger wire), the other will be for 12v going to the seat heater controller. You will have your seat heaters on a fused circuit as well. See a relay board diagram for details 4. Ground the seat heatercontroller to chassis and you should be good to go. Lastly, there is a nifty defrost harness that fits snugly over the two pins on the relay board. I bought one on-line. Good luck, |
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| keely444 |
May 17 2015, 06:03 PM
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#4
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Member Group: Members Posts: 103 Joined: 4-May 15 From: santa cruz Member No.: 18,702 Region Association: None |
Thanks for the suggestions Guys.This will be helpful.
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| 2ma2 |
May 17 2015, 07:30 PM
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#5
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Newbie Group: Members Posts: 9 Joined: 4-June 14 From: california Member No.: 17,436 Region Association: None |
I would go to auto zone and buy a 30 amp relay and an accessory fuse block run the relay with the switched power to its input then run a heavy wire to a few of the fuse terminals. Use 2 of the fuses at 10 amps for the heaters and any other accessories can be run off the same fuse box. You might need more than one relay if you add a lot of accesories
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| flylarry |
May 17 2015, 07:49 PM
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#6
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Newbie Group: Members Posts: 38 Joined: 22-November 05 From: Carlsbad, CA Member No.: 5,170 |
I agree with Jim, there is a spot on the relay board for a relay, fuse holder and 2 pins for rear defrost you can use. Maybe consider an up-graded alternator.
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| boxsterfan |
May 17 2015, 08:25 PM
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#7
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914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
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| 76-914 |
May 17 2015, 08:42 PM
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#8
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,502 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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I've got s set of those butt warmers but I've got a 175amp alt. I'm afraid of taxing a stock set up.
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