Purchased 5th wheel new several years ago and I believe I've never had much braking since. At the time, I installed a new P3 controller in my truck. Controller shows everything working normal. Hav...
It is obvious the brakes are not working as they should. The question is why? The trailer tests fine on its own at multiple shops. Brakes were adjusted by multiple shops. The trucks brake controller shows no issue, shows trailer connected etc. When using the manual lever, it shows expected voltage and amps. When driving slow and using the manual lever, no brake action is felt at all. However, I do notice some difference if I test with the truck wiring disconnected from trailer when stopping. So brakes are working to an extent, just very slight. Question is if it is possible the P3 brake controller is not supplying enough volts/amps despite showing it is on its display.
The test is do the brakes work or not...voltage and readouts don't matter. Make the shop do a test ride with you when they say it's fine. If it doesn't stop, it's broken regardless of what they say or what the readouts are.
About Technical Issues
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Connect with others who have been in your shoes.","title":"Technical Issues","shortTitle":"Technical Issues","parent":{"__ref":"Category:category:RVTalk"},"ancestors":{"__typename":"CoreNodeConnection","edges":[{"__typename":"CoreNodeEdge","node":{"__ref":"Community:community:feyqc97479"}},{"__typename":"CoreNodeEdge","node":{"__ref":"Category:category:RVTalk"}}]},"userContext":{"__typename":"NodeUserContext","canAddAttachments":false,"canUpdateNode":false,"canPostMessages":false,"isSubscribed":false},"theme":{"__ref":"Theme:customTheme1"},"boardPolicies":{"__typename":"BoardPolicies","canViewSpamDashBoard":{"__typename":"PolicyResult","failureReason":{"__typename":"FailureReason","message":"error.lithium.policies.feature.moderation_spam.action.access_spam_quarantine.allowed.accessDenied","key":"error.lithium.policies.feature.moderation_spam.action.access_spam_quarantine.allowed.accessDenied","args":[]}},"canArchiveMessage":{"__typename":"PolicyResult","failureReason":{"__typename":"FailureReason","message":"error.lithium.policies.content_archivals.enable_content_archival_settings.accessDenied","key":"error.lithium.policies.content_archivals.enable_content_archival_settings.accessDenied","args":[]}},"canPublishArticleOnCreate":{"__typename":"PolicyResult","failureReason":{"__typename":"FailureReason","message":"error.lithium.policies.forums.policy_can_publish_on_create_workflow_action.accessDenied","key":"error.lithium.policies.forums.policy_can_publish_on_create_workflow_action.accessDenied","args":[]}}},"topicsCount":24239,"messageActivity":{"__typename":"MessageActivity","corePropertyChangeTime":"2025-04-25T14:06:51.651-07:00"},"avatar":{"__ref":"AssociatedImage:{\"url\":\"https://community.goodsam.com/t5/s/feyqc97479/images/bi0xNC01NjBpRjZEQTJBOEZFMzZFOUFBMw\"}"},"eventPath":"category:RVTalk/community:feyqc97479board:TechnicalIssues/"},"ForumTopicMessage:message:3673923":{"__typename":"ForumTopicMessage","uid":3673923,"subject":"Brake Controller load testing?","id":"message:3673923","revisionNum":1,"repliesCount":3,"author":{"__ref":"User:user:880"},"depth":0,"hasGivenKudo":false,"board":{"__ref":"Forum:board:TechnicalIssues"},"conversation":{"__ref":"Conversation:conversation:3673923"},"readOnly":false,"editFrozen":false,"moderationData":{"__ref":"ModerationData:moderation_data:3673923"},"body@stripHtml({\"truncateLength\":200})":" Purchased 5th wheel new several years ago and I believe I've never had much braking since. At the time, I installed a new P3 controller in my truck. Controller shows everything working normal. Hav...","body@stringLength":"599","rawBody":"
Purchased 5th wheel new several years ago and I believe I've never had much braking since. At the time, I installed a new P3 controller in my truck. Controller shows everything working normal. Have tried increasing voltage, boost etc. Pushing manual lever while moving has no notiable effect, can't feel any braking from trailer. Have had multiple shops look at trailer and all say no problem. Last shop adjusted trailer brakes, tested magnets, wiring etc. Is it possible the P3 controller is faulty even though it's display shows everything working?
The test is do the brakes work or not...voltage and readouts don't matter. Make the shop do a test ride with you when they say it's fine. If it doesn't stop, it's broken regardless of what they say or what the readouts are.
","body@stringLength":"248","rawBody":"
The test is do the brakes work or not...voltage and readouts don't matter. Make the shop do a test ride with you when they say it's fine. If it doesn't stop, it's broken regardless of what they say or what the readouts are.
It is obvious the brakes are not working as they should. The question is why? The trailer tests fine on its own at multiple shops. Brakes were adjusted by multiple shops. The trucks brake controller shows no issue, shows trailer connected etc. When using the manual lever, it shows expected voltage and amps. When driving slow and using the manual lever, no brake action is felt at all. However, I do notice some difference if I test with the truck wiring disconnected from trailer when stopping. So brakes are working to an extent, just very slight. Question is if it is possible the P3 brake controller is not supplying enough volts/amps despite showing it is on its display.
","body@stringLength":"738","rawBody":"
It is obvious the brakes are not working as they should. The question is why? The trailer tests fine on its own at multiple shops. Brakes were adjusted by multiple shops. The trucks brake controller shows no issue, shows trailer connected etc. When using the manual lever, it shows expected voltage and amps. When driving slow and using the manual lever, no brake action is felt at all. However, I do notice some difference if I test with the truck wiring disconnected from trailer when stopping. So brakes are working to an extent, just very slight. Question is if it is possible the P3 brake controller is not supplying enough volts/amps despite showing it is on its display.
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