I know circuits on heavy equipment but my truck got me baffled.Summer time truck is fine Winter time when i use the heater blower the amp gauge leans more and more to the discharge side . Anyone have a clue with this

 

is it actually draining the battery, or just upping the current draw while it's running?

is it draw from the blower any time it's on or just with heat, not on cool air?

 

anytime blower is on

 

Hmmm, any other accessories cause the same problem? lights? wipers? anything you could plug into the power port to try drawing some current off of it?

if the blower is the only thing doing it, I'd look at the blower motor itself... if other power draws cause the same thing, it's somewhere else in the charging system.

I am really no too great with electrical, so I can't point you toward a cause, but maybe someone else can help out more.

 

It's normal showing heavy currant draw

 

when I turn on my blower, it just dips and returns to normal

 

What year truck? has an amp meter it must be after market or are you talking volt meter there is a big differance. the very first thing i would check is alternater drive belt condition and tension if the blower was pulling to much power it should have blowen the fuse. Bubbabud

 

it's a 96 new alternator new belt . At the battery with volt meter 14.2 at the alt 14.2. I just don't know maybe i'll try a blower and resistor

 

i want a bigger alt but they say that style is it no changing that one for bigger alt