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ICOM Land Mobile Radio - Discussion forum for ICOM land mobile radio equipment such as the IC-F series radios. Please do not post amateur radio topics here.

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  #1 (permalink)  
Old 05-01-2017, 6:07 PM
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Default Ignition power on

Instead of spending the money on the add on for ignition power on. Would a relay on the hot or ground line work instead? I found a heavy duty 200 amp relay with terminal studs similar to a starter relay. Was hoping this would work instead. Don't really want to spend $150 on the add in board if I don't have to because I'm to lazy to reach down and turn it on..lol..

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Old 05-01-2017, 6:14 PM
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You can use a external relay, no need to purchase the ignition cable (I am assuming you're referring to the Icom OPC cable), although 150 seems a little on the high side.

A 5 dollar 30 amp horn relay will work just fine if all you're powering is just the radio.
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Old 05-01-2017, 6:38 PM
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I live in Canada cheapest I can find is $70 for the opc-1939 cable. By the time I factor in exchange and shipping and duty... you get the idea. I have the icom 5023h and if I use a relay it will remember it's last setting of on when I shut ignition down? I figure a heavy duty relay with studs will equall out to less power loss to the radio.

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Old 05-01-2017, 6:43 PM
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Since you're disconnecting the A+ lead with the relay, if you have more then one channel in the radio, it may revert back to channel 1 over time after cycling the power, but as long as the radio is not programmed for ignition control, it will always go on and off with the ignition provided you wire the relay correctly.
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Old 05-01-2017, 6:50 PM
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It will retain memory, scanning, and all that, so no worry's there. A large solenoid/relay with studs (50/75/100+ amp) are overkill for just the radio, but will not hurt anything. Just make sure it's properly fused and your ignition sense is also properly fused wherever that is tapped off from.
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Old 05-01-2017, 6:50 PM
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OK thanks.. most of the time I have my radio set to scan. Thanks for the info

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Old 05-01-2017, 6:51 PM
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Quote:
Originally Posted by tekheavy View Post
Since you're disconnecting the A+ lead with the relay, if you have more then one channel in the radio, it may revert back to channel 1 over time after cycling the power.
Not with Icom. At least, I have yet to find any US models that loose memory.
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Old 05-01-2017, 6:52 PM
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Both my ground and positive are fused at the battery. Trigger wire will be fused at its pickup point

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Old 05-01-2017, 6:53 PM
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Quote:
Originally Posted by zrock View Post
OK thanks.. most of the time I have my radio set to scan. Thanks for the info

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Just remember if you want it to scan all the time even when powered on and off, set the appropriate scan settings, like "power on scan".
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Old 05-01-2017, 6:54 PM
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Quote:
Originally Posted by zrock View Post
Both my ground and positive are fused at the battery. Trigger wire will be fused at its pickup point

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Excellent.
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Old 05-01-2017, 6:59 PM
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Ya it's already set for power on scan... usually leave it on scan due to the fact some of the local loggers cannot get used to the new freq for logging roads and keep reverting back to old freq. Then I can quickly program my priority keys and I'm safe thanks for the info... maby I'll look for a smaller relay but would like to find one with the studs. Then no worries of them working loose

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Old 05-01-2017, 7:09 PM
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I have had good luck with the Tyco 75A relay. They are black plastic. Although the coil is spade terminals, in and out are screw down terminals. I have had better luck with these than the "tin can" style ones. Those sometimes with age will stick, and you have to give them a good wack then they'll work. More so if you're drawing small amounts of power thru them.
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Old 05-01-2017, 7:27 PM
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I just checked that one out on amazon.ca....it must be something they do not want to ship to Canada... $80 was the cheapest...lol

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Old 05-01-2017, 7:35 PM
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Wow! Tyco/TE 75A on Amazon here for 2 dollars and fifty cents with free shipping!

https://www.amazon.com/TE-BOSCH-Curr...2VANZBRPWR1A8W
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Old 05-01-2017, 7:36 PM
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Quote:
Originally Posted by zrock View Post
I just checked that one out on amazon.ca....it must be something they do not want to ship to Canada... $80 was the cheapest...lol

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$2.50

https://www.amazon.com/TE-BOSCH-Curr...ords=75a+relay
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Old 05-01-2017, 7:36 PM
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Guess we posted at the same time.
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Old 05-01-2017, 7:38 PM
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Lol

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Old 05-01-2017, 7:45 PM
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That's insane!

Try Ebay...
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Old 05-01-2017, 7:47 PM
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I stopped using eBay.. had a issue with a $400 purchase and eBay would not step up and solve the issue. That and it usually takes me 2 months to receive anything

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Old 05-01-2017, 7:49 PM
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I'd move.
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