new head unit getting really hot

roundeye69 · 18th March 2011, 06:59 PM

I just installed a pioneer head unit in my 84 mazda, I used a wiring harness and when I turned it on it worked fine for 2 -3 minutes then I lost sound and the head unit got really hot, I unplugged the harness from the stereo and noticed the fuse on the back had blown, im not sure what the problem is, I've installed numerous car stereos with no problems.

firechief · 18th March 2011, 07:21 PM

We need more information on the head unit and the amp. Model #'s. It could be that the amp was dumping power into too low of an impeadance, working really hard, but it has protection circutry that activated the way it was supposed too. If there was a direct short, say on the speakers you would not have heard anything, and the fuse would have blown right away.

roundeye69 · 18th March 2011, 07:55 PM

Its a pioneer deh-3200ub, I don't have an amp.

Perry Babin · 18th March 2011, 07:58 PM

With the harness unplugged from the head unit and the black meter probe on a known good ground, confirm that you read infinite resistance (OL for most meters) on every speaker wire that's connected to a speaker wire in the vehicle.

roundeye69 · 18th March 2011, 08:35 PM

The negative wire on the speaker the numbers on the meter continuously count up but the postive side on the speaker stays at one on the meter.

Perry Babin · 18th March 2011, 08:51 PM

What's the resistance measured directly across the speaker terminals (in the wiring harness) for the channels with speakers connected?

roundeye69 · 18th March 2011, 09:09 PM

At the harness they read infinite resistance, except the rear speakers but they weren't working when I had the head unit on, so I disconnected them. (There's a factory amp for the rear speakers I didn't unhook, and was told wouldn't work with the aftermarket headunit anyway.)

Perry Babin · 18th March 2011, 09:30 PM

Did you have the head unit AND the factory amp connected to the rear speakers?

roundeye69 · 18th March 2011, 09:45 PM

I didn't unplug anything from the amp, but am not sure if its hooked up, there was a weird white cable hooked to the factory radio but isn't hooked up now. Not sure if that was for the amp or not.

Perry Babin · 18th March 2011, 10:28 PM

Did you run new wires directly from the head unit to the speakers?

18th March 2011, 06:59 PM	#1
roundeye69 diyAudio Member Join Date: Mar 2011	new head unit getting really hot I just installed a pioneer head unit in my 84 mazda, I used a wiring harness and when I turned it on it worked fine for 2 -3 minutes then I lost sound and the head unit got really hot, I unplugged the harness from the stereo and noticed the fuse on the back had blown, im not sure what the problem is, I've installed numerous car stereos with no problems.

18th March 2011, 07:58 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	With the harness unplugged from the head unit and the black meter probe on a known good ground, confirm that you read infinite resistance (OL for most meters) on every speaker wire that's connected to a speaker wire in the vehicle. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

18th March 2011, 08:51 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What's the resistance measured directly across the speaker terminals (in the wiring harness) for the channels with speakers connected? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

18th March 2011, 09:30 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Did you have the head unit AND the factory amp connected to the rear speakers? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

18th March 2011, 10:28 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Did you run new wires directly from the head unit to the speakers? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

18th March 2011, 07:21 PM	#2
firechief diyAudio Member Join Date: Sep 2008 Location: Near Seattle Wa	We need more information on the head unit and the amp. Model #'s. It could be that the amp was dumping power into too low of an impeadance, working really hard, but it has protection circutry that activated the way it was supposed too. If there was a direct short, say on the speakers you would not have heard anything, and the fuse would have blown right away.

18th March 2011, 07:55 PM	#3
roundeye69 diyAudio Member Join Date: Mar 2011	Its a pioneer deh-3200ub, I don't have an amp.

18th March 2011, 08:35 PM	#5
roundeye69 diyAudio Member Join Date: Mar 2011	The negative wire on the speaker the numbers on the meter continuously count up but the postive side on the speaker stays at one on the meter.

18th March 2011, 09:09 PM	#7
roundeye69 diyAudio Member Join Date: Mar 2011	At the harness they read infinite resistance, except the rear speakers but they weren't working when I had the head unit on, so I disconnected them. (There's a factory amp for the rear speakers I didn't unhook, and was told wouldn't work with the aftermarket headunit anyway.)

18th March 2011, 09:45 PM	#9
roundeye69 diyAudio Member Join Date: Mar 2011	I didn't unplug anything from the amp, but am not sure if its hooked up, there was a weird white cable hooked to the factory radio but isn't hooked up now. Not sure if that was for the amp or not.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
please help me evaluate which head unit is better ...	oasion23	Car Audio	0	9th May 2010 09:23 AM
Head unit	greg928gts	Car Audio	9	10th June 2009 06:26 PM
Head Unit Amps Off for Sure?	jdgonko	Car Audio	25	7th December 2007 03:11 PM
head unit	basenjifan	Swap Meet	0	24th September 2007 06:58 PM
Head Unit	VoLCoM	Car Audio	4	31st October 2005 02:51 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read