We have a new to us 2002 Winnebago Adventurer. It will usually start, but it turns over more slowly than it should. After driving a hundred miles or so, it will not even turn over until it cools down for about 30 minutes. I suspect the brushes in the starter are bad, but I’m hoping for some added insight. My battery shows 12.6 volts.

12.6V is on the low side. A load test would be useful. Does jumping or using a boost charger on it help speed up the cranking?

I have a battery boost that will connect my house batteries with the engine battery but it doesn’t help. I’ve also tried jumper cables.

Charley67 wrote:I have a battery boost that will connect my house batteries with the engine battery but it doesn’t help. I’ve also tried jumper cables.Usually when boosting doesn’t help, it’s the starter or cables.

I’ve pretty much checked the cables. I think I’m going to pull the starter relay and use a jumper wire to bypass everything. I think that will tell me if it’s the starter or something back up the line. I had thought it might be the remote relay, but I believe they usually just make a single click sound if they’re bad

I have experienced a starter on an older vehicle which bound up when hot due to worn bearings. It worked fine when cold. Just another possibility.

Slow/ No Cranking | Good Sam Community

Dave_H_M
Explorer II
Oct 26, 2019
I seriously doubt that hooking up the starter after it ha been removed will prove anything.
covered_wagon
Explorer
Oct 26, 2019
Sometimes a starter can fail in such a way that even the jumper batteries can be depleted in short order. Best to replace the starter motor after double checking the condition of your batteries under a load test. That is the right way to test them.
hotjag1
Explorer II
Oct 26, 2019
Is it a Chevy/Workhorse chassis? If so, it is probably the starter. They are notorious for cranking slow when they get hot. Replace the starter with the best starter you can find regardless of price(that's what I did) and no more problems with hot start.
If it's a Ford, I don't know if they had the same problem.
Rolling_Condo
Explorer II
Oct 26, 2019
If you haven't. Definitely clean battery connections.
Lwiddis
Explorer II
Oct 26, 2019
On a 2002, I’d want a new starter regardless of the problem.
markchengr
Explorer II
Oct 26, 2019
I have experienced a starter on an older vehicle which bound up when hot due to worn bearings. It worked fine when cold. Just another possibility.
Charley67
Explorer
Oct 25, 2019
I’ve pretty much checked the cables. I think I’m going to pull the starter relay and use a jumper wire to bypass everything. I think that will tell me if it’s the starter or something back up the line. I had thought it might be the remote relay, but I believe they usually just make a single click sound if they’re bad
jkwilson
Explorer III
Oct 25, 2019
Charley67 wrote:
I have a battery boost that will connect my house batteries with the engine battery but it doesn’t help. I’ve also tried jumper cables.

Usually when boosting doesn’t help, it’s the starter or cables.
Charley67
Explorer
Oct 25, 2019
I have a battery boost that will connect my house batteries with the engine battery but it doesn’t help. I’ve also tried jumper cables.
jkwilson
Explorer III
Oct 25, 2019
12.6V is on the low side. A load test would be useful. Does jumping or using a boost charger on it help speed up the cranking?

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