# Pulsing lights alternator and battery good

**URL:** <https://community.cartalk.com/t/pulsing-lights-alternator-and-battery-good/158268>\
**Category:** Maintenance/Repairs\
**Tags:** cr-v, honda\
**Created:** [February 10, 2020, 4:41pm UTC](https://community.cartalk.com/t/pulsing-lights-alternator-and-battery-good/158268 "2020-02-10T16:41:28Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Casey\_Walter](https://avatars.discourse-cdn.com/v4/letter/c/9fc348/32.png) [@Casey\_Walter](https://community.cartalk.com/u/Casey_Walter)\
**Post date:** [February 10, 2020, 4:41pm UTC](https://community.cartalk.com/t/pulsing-lights-alternator-and-battery-good/158268/1 "2020-02-10T16:41:28Z")

</div>

I have a 2004 Honda CRV with pulsing lights throughout the car headlights dome lights dash lights, everything tested fine alternator and battery did a drop test on the ground, positive to alternator and positive to starter everything is fine, cleaned ground connections to body and engine cleaned and tightened battery terminals. Never had a battery light on and tell my alternator died and I replaced it now I have a battery light and still have pulsing lights throughout the car, anybody have any ideas?

---

<div class="post-metadata">

**Author:** ![eddo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/eddo/32/2594_2.png) [@eddo](https://community.cartalk.com/u/eddo)\
**Post date:** [February 10, 2020, 4:47pm UTC](https://community.cartalk.com/t/pulsing-lights-alternator-and-battery-good/158268/2 "2020-02-10T16:47:49Z")

</div>

did you verify clean and tight connections at the alternator? Does the belt squeal at all? is the alternator spinning freeley?

---

<div class="post-metadata">

**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [February 10, 2020, 4:52pm UTC](https://community.cartalk.com/t/pulsing-lights-alternator-and-battery-good/158268/3 "2020-02-10T16:52:24Z")

</div>

Test the alternator for AC ripple voltage.

> **[Alternator Ripple Testing: The Ghost In The Machine](https://www.underhoodservice.com/alternator-ripple-testing-the-ghost-in-the-machine/)**
>
> Before computers and networks in vehicles, an alternator that was producing AC voltage or ripple through the electrical system would cause flickering lights and maybe an ignition problem. Today, excessive ripple voltage can cause communication issues...

Tester

---

<div class="post-metadata">

**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\
**Post date:** [February 11, 2020, 2:38pm UTC](https://community.cartalk.com/t/pulsing-lights-alternator-and-battery-good/158268/4 "2020-02-11T14:38:05Z")

</div>

How fast are the pulsations?  
Have you monitored battery voltage with a fast responding meter or a scope?