wiring up a headunit correctly

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haemphyst

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Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: June 18, 2008 at 8:14 PM / IP Logged

haemphyst wrote:

The starter can pull hundreds of amps during cranking. It would not be surprising to me at all to see a deck nearly turn off, even if wired directly to the battery. Battery age, condition, capacity, connections... all will have dramatic affect on how much the accessory will suffer. I would re-check ALL CONNECTIONS IN THE SYSTEM, including all grounds, (both chassis and engine) and all positive connections. Also, have your battery load-tested. Here in the states, nearly every auto-parts store will load test them for free.

I wouldn't worry about it. If it remains on, albeit in a reduced "on" mode, then your connections are right, and the issue is elsewhere. If the red wire "sees" less than around 10.5 volts, the deck is going to turn off, they're usually built to do so; that is a safety feature, so you aren't left stranded - when the deck turns off, you need to start your car.

As far as the accessory wire, I haven't seen anything since about 1979 that the accessory wire ISN'T interrupted during cranking. Pretty much all cars do that, now. If you mistook your accessory wire as a power wire, then when you crank the starter, it is GOING to turn off.

The illumination wire dims the display on the face of the deck, if there is an illumination wire available in the car. The car's illumination wire turns on with the dash lights, but not all cars are going to have them.

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

i am an idiot

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Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 18, 2008 at 8:22 PM / IP Logged

If both wires are ran to the battery, the only reason for it shutting down or dimming is the fact that the starter (as stated earlier) pulls hundreds of amps. Having a weak battery could cause this dimming or turning off issue. Before you go run out and buy a new battery, try this. With a good set of jumper cables, connect your vehicle to a friends car. With his engine running, start your car. If it does not dim while connected to his battery too, you should look into a new battery.

But I do have to ask this. What is the problem with your radio turning off for the brief time you are attempting to start your car?

techman93

Silver - Posts: 591

Joined: October 28, 2006

Location: Pennsylvania, United States

Posted: June 18, 2008 at 11:25 PM / IP Logged

If you forget to shut off radio you will kill your battery and get stuck.

The wire I'm test'n isn't doin' what it's supposed to be doin'... I am so glad I printed that tech sheet, with the wrong info.

Do it right the first time... or I might have to fix it for ya

twinpawer

Member - Posts: 20

Joined: April 11, 2008

Location: Malta

Posted: June 19, 2008 at 2:45 AM / IP Logged

There's no problem with it :) Its just that my friend's car didn't do it and I thought I'd ask about it. As for forgetting the radio.. well I think one must be quite dumb not to hear the sound coming from the radio, and switching it off before going out :)

My battery is less than a year old, and should be quite good. What I'm sure is that the starter motor does take quite a good amount of charge, as its a large one because my car is quite difficult to start on cold mornings. And its also a Diesel - I was told diesel are more difficult to start than petrol engines?

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 19, 2008 at 6:34 AM / IP Logged

Why yes, I too have heard that diesel engines are a little harder to start than petrol engines. Maybe that is why the larger diesel engines in the U.S. have 2 batteries.

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wiring up a headunit correctly

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