Personal guarantees work similarly to co-signing a loan for a friend. Some creditors won't report it to your personal credit others will.
Here's my experience of who reports the personal guerentee to the credit burrows
Sunbelt - did not report on personal
Bank of America (line of credit) - reported
Bank of America (auto loans) - reported
Why do people not respect us as they do other tradesmen? Because every Tom, Dick, and Harry doesn't think he can be a plumber or electrician!