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Old 09-25-2020, 08:31 PM   #11
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Quote:
Originally Posted by Deerhurst View Post
4x45w isn't much. At full load it's 15A. That is peak. RMS will be much lower.


The head unit I run is rated for 4x55w and 17w RMS. It runs just fine off the trucks wiring harness.




Wiring harness adapter and let it rip!
It is 45w per ch. RMS. However, I did as a couple of you have suggested and skipped the battery connect. Works perfectly. Thanks all for the assistance.

Jim in STL
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Old 09-25-2020, 10:39 PM   #12
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4x45 is still only 180w total at peak. You'll be closer to 70w total at the RMS rating. Probably less. That's very minimal speaker power.



The amp rating I stated is based off 180w at 12v. The truck only sees one current load which the head unit divides for the speakers.





Glad you got it all hooked up and running!
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Old 09-27-2020, 03:16 AM   #13
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Some headunits that have high power are supposed to go directly to the battery, the Sony I put in my wife's car is rated 45x4 (CTA2006 spec) 100 watts peak. I wired the one power wire directly to the battery, I can't recall what the fuse rating in the car is for the radio.
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Old 09-27-2020, 09:15 AM   #14
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Cruthfield told me I had to go directly to battery as the Sony I bought from them has a built in 45 watt amp.
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Old 09-28-2020, 01:37 PM   #15
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Quote:
Originally Posted by kellybig View Post
Crutchfield told me I had to go directly to battery as the Sony I bought from them has a built in 45 watt amp.

Watts = volts x amps


So 45 watts is just under 4 amps
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Old 09-29-2020, 02:33 AM   #16
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So was going direct to battery for power unnecessary?
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Old 09-29-2020, 03:23 AM   #17
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I'd say yes. As long as the OE wiring and OE fuse can handle what the head unit is rated for it's probably overkill.



I've got 900w to the amp in my car. That's 75amps which, I believe, is more than the D21 alternator can supply. That needs to go to the battery. 100w or so, unnecessary. You'll never see those peak currently spikes for any length of time.
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Old 09-29-2020, 05:50 PM   #18
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Oh well. I suppose I’m ready to add a larger amp in the future if it is ever something I want to do.
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Old 09-29-2020, 07:51 PM   #19
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If you add an amp you don't have to touch the power for your head unit. Just run an entire new line with it's own fuse.
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