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76-914 |
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Repeat Offender & Resident Subaru Antagonist ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 13,513 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 |
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Repeat Offender & Resident Subaru Antagonist ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 13,513 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California ![]() ![]() |
Use the negative side to switch the backup lights on and off. It is usually safer to run 12V to the coil of the relay, then the negative of the coil to the switch on the trans. One way to look at it is if the contacts of the switch were to be accidentally grounded, you won't blow a fuse; the light will just turn on. If it were 12V, then a fuse would blow. That was exactly my thinking as well. Right down to the backup short circuit displaying a CEL thru the back up lights. (IMG:style_emoticons/default/lol-2.gif) When cannibalizing that Subaru I noticed neg switching was the way. For my stock trans w/ custom harness, I just took a wire with inline fuse-holder from the starter to the backup switch, then from the switch to the rev lights. That would be bad with a stock harness if you left it in reverse as that terminal on the starter is hot all the time. True. And a fuse holder would be prone to corrosion in that area as well. |
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