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Old 11-03-2012, 11:39 AM   #1 (permalink)
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Radio Installation Test

I bought a used Radio Tech am/fm radio from a member on this forum. Before I installed it, I wanted to bench test it first. The first thing I do is check the in line fuse for the hot wire on the radio wire harness. It's blown. So, I go get a bunch(just in case) of replacement fuses and lo and behold I pop two more.

I'm attaching the black wire to negative terminal. The red wire and the orange/white wire to positive terminal. As soon as I connect the red and orange/white wire to the battery the fuse pops.

I don't think I'm doing anything wrong and what has me worried is the fuse was blown when I received the radio.

Am I not connecting the radio correctly? I know the orange/white is supposed to go to a switch wire, but for testing purposes I think I can go directly to the battery, right?

I have verified that there is no short in the three wires from the battery connections through the deutsch plug connection in the radio wiring harness.

Last edited by xk49; 11-03-2012 at 12:03 PM. Reason: More testing information
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Old 11-03-2012, 01:37 PM   #2 (permalink)
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Quote:
Originally Posted by xk49 View Post
I bought a used Radio Tech am/fm radio from a member on this forum. Before I installed it, I wanted to bench test it first. The first thing I do is check the in line fuse for the hot wire on the radio wire harness. It's blown. So, I go get a bunch(just in case) of replacement fuses and lo and behold I pop two more.

I'm attaching the black wire to negative terminal. The red wire and the orange/white wire to positive terminal. As soon as I connect the red and orange/white wire to the battery the fuse pops.

I don't think I'm doing anything wrong and what has me worried is the fuse was blown when I received the radio.

Am I not connecting the radio correctly? I know the orange/white is supposed to go to a switch wire, but for testing purposes I think I can go directly to the battery, right?

I have verified that there is no short in the three wires from the battery connections through the deutsch plug connection in the radio wiring harness.
First off, do you have the correct size fuse??? Did you try just connecting the black to neg and red to pos???





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Old 11-03-2012, 02:18 PM   #3 (permalink)
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orange wire

First off, let me state I do not have any experience with motorcycle radios. Having said that, the orange wire on a car receiver is usually the remote wire that turns on other devices like amplifiers. It shouldn't cause a problem hooking it to +12 volts. But, you shouldn't need to connect it at all.

I hope this helps.

Quote:
Originally Posted by xk49 View Post
I bought a used Radio Tech am/fm radio from a member on this forum. Before I installed it, I wanted to bench test it first. The first thing I do is check the in line fuse for the hot wire on the radio wire harness. It's blown. So, I go get a bunch(just in case) of replacement fuses and lo and behold I pop two more.

I'm attaching the black wire to negative terminal. The red wire and the orange/white wire to positive terminal. As soon as I connect the red and orange/white wire to the battery the fuse pops.

I don't think I'm doing anything wrong and what has me worried is the fuse was blown when I received the radio.

Am I not connecting the radio correctly? I know the orange/white is supposed to go to a switch wire, but for testing purposes I think I can go directly to the battery, right?

I have verified that there is no short in the three wires from the battery connections through the deutsch plug connection in the radio wiring harness.
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Old 11-03-2012, 02:59 PM   #4 (permalink)
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I've tried just hooking up just the red and black. The fuse immediately blows no matter which order I connect them in. The radio came with a 5A fuse. I'm using 5A fuses as replacements.
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Old 11-04-2012, 08:07 AM   #5 (permalink)
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I completely disassemble the entire unit isolating each component board. I then hooked each board and associated parts. in sequence starting at the radio wire harness. There were three primary boards and some misc compenents(ie. LCD display, push botton interface, relays). I just hooked each one in turn to the wire harness and using the multimeter checking for shorts, nothing obvious. I then disconnected everything again, hooked up the wire harness to a battery then reassembled each component in turn to see which one was going to pop the fuse, nothing?

Radio appears to work now. Didn't change the red,oragne/white, black battery connections. There might have been a poor connection on the circuit boards and I accidentally fixed it as I disassembled and reassembled the parts.
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Old 11-04-2012, 09:59 AM   #6 (permalink)
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Quote:
Originally Posted by xk49 View Post
I completely disassemble the entire unit isolating each component board. I then hooked each board and associated parts. in sequence starting at the radio wire harness. There were three primary boards and some misc compenents(ie. LCD display, push botton interface, relays). I just hooked each one in turn to the wire harness and using the multimeter checking for shorts, nothing obvious. I then disconnected everything again, hooked up the wire harness to a battery then reassembled each component in turn to see which one was going to pop the fuse, nothing?

Radio appears to work now. Didn't change the red,oragne/white, black battery connections. There might have been a poor connection on the circuit boards and I accidentally fixed it as I disassembled and reassembled the parts.
Look closely at the wiring harness where it goes into the case, sounds like more of a short than an open wire.




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