head lights dim with brake app. - Mazda Forum
 
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post #1 of 5 (permalink) Old 01-07-2017, 02:09 PM Thread Starter
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head lights dim with brake app.

I need an opinion here, and what do to correct it. When applying the brakes the head lights dim for a split second and then come back as before, the brake application. Is this a bad ground causing this? Could it be the ground cable, engine to the frame by the starter? or some other spot.
Thanks all for your in put.
nivram

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post #2 of 5 (permalink) Old 01-08-2017, 12:26 PM
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are you sure your battery and alternator are up to snuff?
TomK

2001 Mazda Millenia 2.5L Champagne Silver Mica 190,000 miles
2002 BMW 530iA Sterling/black 95,000 miles
2006 Volvo XC70 Blue 136,000 miles
2001 Mazda Millenia 2.5L Brilliant Black 213,000 miles - SOLD
1993 Mazda 626 2.5L ATX 235,000 miles - SOLD
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post #3 of 5 (permalink) Old 01-10-2017, 02:45 PM Thread Starter
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Kutcht1;
You hit the nail right on the head. checked out the battery, seemed a little low on ambient charge. Started the engine alt. checked out, and the cleaned the battery terminals again. This solved my problem, poor connections on the battery. Do the simple checks first. Need a solution to keep the terminals working good after cleaning. I've used dielectric grease, regular grease, Vaseline. nothing seems to work for long. I think that this has an effect on every thing in the car thats has to do with electrical, poor connections. especially on these Mazda's.

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post #4 of 5 (permalink) Old 01-11-2017, 10:24 PM
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I have had no issues with corrosion on either of my Millenias. If I were you I would go around and check all of your grounding points ( these four for sure: Right and left wheel well areas, starter, and connector on top of transmission) and take them off and clean them, put small amount of anti-seize on them and re-install. Something is stressing the system if you are getting corrosion.
Here is a link to a diagram of where those grounding points are:
Ground Wires

TomK

2001 Mazda Millenia 2.5L Champagne Silver Mica 190,000 miles
2002 BMW 530iA Sterling/black 95,000 miles
2006 Volvo XC70 Blue 136,000 miles
2001 Mazda Millenia 2.5L Brilliant Black 213,000 miles - SOLD
1993 Mazda 626 2.5L ATX 235,000 miles - SOLD
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post #5 of 5 (permalink) Old 01-12-2017, 01:37 PM Thread Starter
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Thanks Tom,
I did know that poor grounds cause battery corrosion. I will check this out cause I've had a lot of corrosion, more than I should have. Same with my truck. Things to do when good weather gets here.

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