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We have a new alternator, new chasis batteries but when we…

Customer Question
We have a new...

We have a new alternator, new chasis batteries but when we have the engine on and turn on any lights in our RV the voltage meter on the dash goes down.

Mechanic's Assistant: Have you checked the fuses? The dashboard bulbs?

No.

Mechanic's Assistant: What is the model/year of your RV?

2005 safari cheetah. Cat C7

Mechanic's Assistant: Are you fixing your Safari yourself? What have you tried so far?

We had the alternator rebuilt and changed the batteries.

Submitted: 11 months ago.Category: RV
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Answered in 40 minutes by:
9/15/2017
RV Mechanic: Randall, RVIA Certification replied 11 months ago
Randall
Randall, RVIA Certification
Category: RV
Satisfied Customers: 14,613
Experience: RVDA/RVIA Master Certified Technician with many years experience.
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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.

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Customer reply replied 11 months ago
ok
RV Mechanic: Randall, RVIA Certification replied 11 months ago

The interior lights in the cabin are powered off the house batteries. I would start by checking them for water levels and dirty cable and if they are 3 years old I would have them load tested to be sure they are viable. Most won't go more than about 3 years. Let me know how this checks out and we can go from there if needed. All follow ups are included in our fee. No time limit.

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RV Mechanic: Randall, RVIA Certification replied 11 months ago

I​f they are not holding their charge for any reason the voltage will be affected by them on the others. I suspect that this is what is happening. Load testing them will confirm this or not. If those check out good we can look into other causes that are not as common.

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RV Mechanic: Randall, RVIA Certification replied 11 months ago

H​eading to the barn.............I will check back in the morning.

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Customer reply replied 11 months ago
sorry. ok so when we turn the engine on it shows a good voltage but when we turn the head lights on it dips near 11 volts
RV Mechanic: Randall, RVIA Certification replied 11 months ago

I would perhaps check those even though they are new and see if one is failing and drawing the other one down. They should draw down some, but not 3 volts with the engine running. Even brand new batteries have a fairly high failure rate on some brands.

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RV Mechanic: Randall, RVIA Certification replied 11 months ago

Just checking back in to see if you were able to resolve this issue?

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