stereo making engine cut out - The 1947 - Present Chevrolet & GMC Truck Message Board Network

roadkill69 · 07-25-2016, 12:43 AM

I recently installed a new stereo and amp in my 1970 c10. It's a 1200w jvc powering 2 8" subs. I noticed that when I hooked this up my motor will have a rough idle or cut out when driving while the stereo is turned up. I installed a 1/2 farad capacitor and that didn't seem to help. Obviously the stereo is pulling too much voltage from the motor. The alternator is a 100 amp acdelco brand new. Anybody know what could be causing this.?

**special-K** · 07-25-2016, 06:39 AM

I'm not much on this topic, but 100 amp should be way plenty. These trucks came with something under 40a (37a?) with upper 40s the max capacity for windings. Tell us more about the truck, engine, ignition, LS-swap w/computer?

67 chevelle · 07-25-2016, 07:55 AM

hei's are picky about voltage drop , ,you might try direct wiring to the battery for you ignition , using a relay to the old ignition wire , monitor battery voltage

**jeffahart** · 07-25-2016, 03:04 PM

I wired my amp to the battery, per instructions. Since I did my rewire that's the only accessory coming off the battery, plus the winch(is a winch an accessory?) Anyhow, how did you wire your amp?

roadkill69 · 07-26-2016, 01:54 AM

Truck has a 305 tpi out of 1990 camaro. Motor is pretty much stock except headers. I have 2 wires coming off the back of the alterantor. 1 is the hot wire that charges the battery. The other is going to a harness on the firewall. I'm wondering if I need to just run this wire to the junction block?the wire runs into this harness

roadkill69 · 07-26-2016, 02:03 AM

The electric fans and power windows along with the amp is wired directly to the battery? Ignition is wired to the fuse block.

07-25-2016, 12:43 AM	#1
roadkill69 Registered User Join Date: Jul 2013 Location: Bakersfield, CA Posts: 15	stereo making engine cut out I recently installed a new stereo and amp in my 1970 c10. It's a 1200w jvc powering 2 8" subs. I noticed that when I hooked this up my motor will have a rough idle or cut out when driving while the stereo is turned up. I installed a 1/2 farad capacitor and that didn't seem to help. Obviously the stereo is pulling too much voltage from the motor. The alternator is a 100 amp acdelco brand new. Anybody know what could be causing this.? Attached Images

07-25-2016, 06:39 AM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: stereo making engine cut out I'm not much on this topic, but 100 amp should be way plenty. These trucks came with something under 40a (37a?) with upper 40s the max capacity for windings. Tell us more about the truck, engine, ignition, LS-swap w/computer? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

07-25-2016, 07:55 AM	#3
67 chevelle Registered User Join Date: May 2013 Location: WEST PALM FLORIDA Posts: 1,174	Re: stereo making engine cut out hei's are picky about voltage drop , ,you might try direct wiring to the battery for you ignition , using a relay to the old ignition wire , monitor battery voltage __________________ 68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive

07-25-2016, 03:04 PM	#4
jeffahart Senior Member Join Date: May 2012 Location: Scottsdale, AZ Posts: 1,906	Re: stereo making engine cut out I wired my amp to the battery, per instructions. Since I did my rewire that's the only accessory coming off the battery, plus the winch(is a winch an accessory?) Anyhow, how did you wire your amp? __________________ White K20

07-26-2016, 01:54 AM	#5
roadkill69 Registered User Join Date: Jul 2013 Location: Bakersfield, CA Posts: 15	Re: stereo making engine cut out Truck has a 305 tpi out of 1990 camaro. Motor is pretty much stock except headers. I have 2 wires coming off the back of the alterantor. 1 is the hot wire that charges the battery. The other is going to a harness on the firewall. I'm wondering if I need to just run this wire to the junction block?the wire runs into this harness Attached Images

07-26-2016, 02:03 AM	#6
roadkill69 Registered User Join Date: Jul 2013 Location: Bakersfield, CA Posts: 15	Re: stereo making engine cut out The electric fans and power windows along with the amp is wired directly to the battery? Ignition is wired to the fuse block.

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