* Dollar up but trims gains after Senate OKs bailout
* Investors nervous about outcome of second House vote
* Money market strains spark dollar scramble
By Eric Burroughs
TOKYO, Oct 2 (Reuters) - The dollar climbed near a one-year peak against a basket of currencies on Thursday but surrendered some gains after the U.S. Senate passed a $700 billion bank bailout plan seen as crucial to helping resolve the year-long credit crisis.
Investors were nervous about whether the House of Representatives would also approve the sweeping rescue plan after its rejection at the start of the week sparked the biggest one-day drop in the S&P 500 <.SPX> since the 1987 crash.
"The House is the problem," said a senior currency trader in Hong Kong.
House Financial Services Committee Chairman Barney Frank told CNN the bill was more likely to pass in the House but the outcome was still uncertain.
The dollar has surged this week because the financial crisis has started taking a toll on European banks, hitting the euro and pound. European leaders were at loggerheads in debating a U.S.-style financial resue.
Banks and funds have also scrambled to buy the greenback on the open market because they are all but shut out from borrowing funds in frozen money markets, with players fearing potential defaults by counterparties since the demise of Lehman Brothers. At the same time, U.S. investors are believed to be bringing home funds from their huge overseas holdings of stocks and bonds, giving the dollar a boost.
The confluence of factors has pushed the euro and sterling down about 3 to 4 percent against the dollar so far this week.
The Senate voted 74-25 in favour of the huge spending bill that would give the Treasury the authority to buy toxic mortgage-related assets to help stem the massive asset write-downs gripping the global financial system. [
]"Assuming that the House does pass it Friday we should see a rebound in global asset markets and some retracement in the dollar," said Callum Henderson, chief currency strategist at Standard Chartered in Singapore.
The dollar index, a gauge of its performance against six major currencies, rose 0.2 percent to 79.899 <.DXY> -- near a one-year peak struck last month but off a high of 80.025 hit before the Senate vote.
The dollar was little changed at 105.79 yen <JPY=> but was well off a four-month low of 103.50 yen struck earlier in the week.
The euro dipped around 0.4 percent to $1.3954 <EUR=> and was near a one-year low of $1.3882 struck last month. The euro fell about 0.4 percent against the yen to 147.56 yen <EURJPY=R>.
Some investors still harboured doubts about how effective the measure would be at bringing an end to the crisis.
"Considering the depth of the problems, the bias is likely to continue to be toward avoiding risk," said a trader for a Japanese trust bank.
With the dollar and the euro both lacking appeal at this point, the yen is likely to benefit, he said. The euro's drop against the yen could gain steam if the single European currency were to break below 147 yen to what would be its lowest levels in more than two years, the trader said.
While the dollar has surged this week, data has painted a grim picture of the U.S. economy's health that could prompt the Federal Reserve to mull cutting interest rates further from 2 percent.
Auto sales plunged 26 percent in September as consumer confidence slid and financing has become more difficult to obtain, while manufacturing activity shrank at the fastest pace since the 2001 recession. [
]But since the European Central Bank has yet to cut interest rates, investors believe it may have more room to do so than the Fed and thereby erode the euro's yield advantage over the dollar.
The ECB wraps up a policy meeting later in the day and is widely expected to keep rates on hold at 4.25 percent. [
] (Additional reporting by Masayuki Kitano and Kevin Yao in Singapore; Editing by Michael Watson)