A switch to the production of batteries and electric cars could save Ford jobs at Bridgend, an AM said.
Ford wants to cut 370 workers in the first phase up to 1
Huw Irranca-Davies said the Welsh government wanted to help the company set up new production lines.
The Ogmore AM said, "This decision will not be taken by Ford Bridgend, but by Ford of Europe and Ford globally.
" However, they know they have a partner available within the government Welsh.
"The Welsh government has traditionally invested heavily in the Ford plant and if we need to invest again, I know the Welsh government will do so."
He invited the company to work with the Welsh government to look at new production lines and build electric and battery-powered cars.
Irranca-Davies said she spoke with Bridgend AM and former Prime Minister Carwyn Jones and said she was "determined" as the current Prime Minister Mark Drakeford to help.
"If we can help Ford to reorganize them for the future to keep this plant there for another 20 or 30 years, we will do it," he added.
- Ford: 1,000 Bridgend job losses by 2021 outlined to trade unions
- Ford Bridgend could lose 1,160 jobs in the worst case
"We want Ford Europe to engage with us and say" yes, it's a brilliant workforce who has demonstrated over and over again to adapt and confront new challenges. "
If the plans go ahead, 990 jobs to be lost at Bridgend – nearly half of the site's workforce – will go in two stages within 2021, as part of 1,150 losses across the UK.
Ford refused to confirm the figures and said he was consulting the trade unions in view of implementing a "global transformation strategy".  Suzy Davies, Welsh Conservative AM for South Wales West, said it could be the "first real test for the new prime minister"
The Welsh government has supported Ford Dragon Engine project plans to build its new generation of gasoline engines in the plant with an offer of 14.6 million pounds, but it will only employ around 500.
Mrs Davies said: "The Minister of 39. Economy said that the Welsh government would only support Ford if five years of sustainable and secure work was guaranteed.
"Should we know how difficult the Welsh government has led Ford to keep those promises?"
He also poured cold water on the discussions about electric motors produced on the site.
"Three years after the line, there seems to have been no progress on this," he added.
Rhun ap Iorwerth of Plaid Cymru said, "Questions have been raised about the future of the plant for a while.
" The Welsh Labor Government should already be at the door of the leadership Ford who presses them on this decision, which apparently will lead to dire consequences for thousands of families who rely on Ford for employment. "
The Welsh Government refused to comment.