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Alt output question - roadrunner with AC and PW #2885189 02/07/21 04:34 PM 02/07/21 04:34 PM
Joined: Feb 2003 Posts: 1,228 Maple Valley, WA 70mopes OP pro stock
70mopes OP pro stock Joined: Feb 2003 Posts: 1,228 Maple Valley, WA	I restored a 69 roadrunner that has factory PW and AC. I have always had an issue with windows rolling up all the way. Fronts do well but rears are mainly the issue. I know motors are working against spring rate going up. I put it together not knowing if alt is a 37/46 or 60 amp alt. Still do not know. I know now that is should be 60 for my application. Would an alternator of lesser amperage/output have an affect on window operation? Currently the rate going up does not change much when engine rpms are raised. Thanks Moparts

Re: Alt output question - roadrunner with AC and PW [Re: 70mopes] #2885385 02/08/21 12:05 AM 02/08/21 12:05 AM
Joined: Jan 2003 Posts: 32,922 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,922 Grand Prairie,Texas	You could try lubing the window slides etc.

Re: Alt output question - roadrunner with AC and PW [Re: 70mopes] #2885432 02/08/21 08:57 AM 02/08/21 08:57 AM
Joined: Jun 2014 Posts: 1,321 VA D dragon slayer pro stock
dragon slayer pro stock D Joined: Jun 2014 Posts: 1,321 VA	Originally Posted by 70mopes I restored a 69 roadrunner that has factory PW and AC. I have always had an issue with windows rolling up all the way. Fronts do well but rears are mainly the issue. I know motors are working against spring rate going up. I put it together not knowing if alt is a 37/46 or 60 amp alt. Still do not know. I know now that is should be 60 for my application. Would an alternator of lesser amperage/output have an affect on window operation? Currently the rate going up does not change much when engine rpms are raised. Thanks Moparts No. Not for a motor that size. The load of the motor would have to be great enough to exceed the capacity of the alternator and cause voltage to droop. Lights dimming, etc...

Re: Alt output question - roadrunner with AC and PW [Re: dragon slayer] #2885433 02/08/21 09:06 AM 02/08/21 09:06 AM
Joined: Aug 2007 Posts: 6,095 Valencia, España NachoRT74 master
NachoRT74 master Joined: Aug 2007 Posts: 6,095 Valencia, España	If the windows are dragging the motor will request more power from the alt/batt. Now, you need to find the reason why they are slow, Glass dragging or motor needing service ? armature tracks and brushes into the motors could be needing a service. ANYWAY, do it a favor yourself, get an alt able to source 45-55 amps minimun at iddle... the more, the better, but at least that. TRUST ME. The charging system ( including ammeter ) will be more relaxed Last edited by NachoRT74; 02/08/21 09:18 AM. With a Charger born in Chrysler assembly plant in Valencia, Venezuela

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