Okay, I am officially stumped. My Innovate wideband instructions says you're supposed to power and ground it straight from the battery by way of a relay such that it will only power on when the car is on. I had a new relay kicking around, so I thought I would use it. It's single pole, double throw, whatever that means.
Anyway, what they want you to do is have one of your switched power circuits run the coil side of the relay. Okay, seems easy enough. So, I mocked it up and tested it, and it did power up the wideband when I turned the key to on. So then, I made the connections permanent and put the terminals into a nice plastic connector so everything would stay together and be reliable. Hooked the battery back up, turned the key on and.... nothing. I had hooked the switched power radio circuit to the relay coil. I checked the radio fuse, and it was popped. This is fuse 11, that it shares with nothing else. Replace fuse, try again, fuse is popped.
Well, I don't know that much about relays, maybe I did something wrong. Here's how I had the relay:
85 - Ground
86 - Pwr from radio circuit
87 - run to the Red power circuit on the wideband
30 - Power straight from the battery
Found the page below.
Okay, does the relay have a diode?
Yes it does. So, what side is what?
So, I'd had the switched power from the radio circuit on pole 86 (since it had a plus by it and everything, but how silly of me ), so that wasn't right. I thought I would try switching 85 and 86. Hooked the power up, turned the key on and it popped the &%$# fuse again! I have NO idea what the problem is at this point.
Does it maybe have something to do with the amp rating of the relay? It's a 30 amp relay, the fuse 11 radio circuit is 15 amps, and the wideband power circuit is 5 amps (THAT fuse never blew, by the way).
Should I not have run the negative side of the relay coil to ground?! Is that it?! I've done relays like this in the past and never had a problem.
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